WO2002089219A1 - Appareil electroluminescent - Google Patents
Appareil electroluminescent Download PDFInfo
- Publication number
- WO2002089219A1 WO2002089219A1 PCT/JP2002/003759 JP0203759W WO02089219A1 WO 2002089219 A1 WO2002089219 A1 WO 2002089219A1 JP 0203759 W JP0203759 W JP 0203759W WO 02089219 A1 WO02089219 A1 WO 02089219A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light emitting
- light
- emitting device
- emitting element
- concave portion
- Prior art date
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- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
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- H01L33/50—Wavelength conversion elements
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Definitions
- the present invention relates to a light emitting device used for various light sources such as a backlight light source, a display, and illumination, and an optical sensor, and particularly to a light emitting device having excellent reliability.
- Such light-emitting devices are used for light sources for optical print heads, liquid crystal backlight sources, light sources for various meters, and various reading sensors, for example, by taking advantage of their features such as low power consumption, small size, and light weight. ing.
- An example of such a light emitting device is a light emitting device as shown in FIG.
- the LED chip 1 is die-bonded as a light emitting element on the lead electrode 2 exposed from the bottom surface of the recess, and the LED chip is provided.
- Each of the electrodes is electrically connected to a lead electrode 2 provided on the package by a gold wire 4 or the like.
- the LED chips arranged in the recesses in this way are sealed with the translucent mold resin 9 or the like. As a result, the LED chips and wires arranged inside the package can be protected from the external environment such as moisture and external force, and a light emitting device having extremely high reliability can be obtained.
- the temperature may change to ⁇ 20 or less +80 or more depending on the outside temperature.
- vibration at the same time as external air pressure and thermal shock.
- the LED chip is peeled off from the die pond resin due to expansion or contraction of the mold resin or the like, and the intensity and directional characteristics of the emitted light change.
- the wire may break, causing no light emission at all.
- the light emitting element generates heat by power consumption.
- the light-emitting device having the above configuration The heat generated from the light emitting element can be released to the substrate via the lead electrode.
- the heat dissipation effect is not sufficiently satisfactory. If a large current is applied to the light emitting device described above in order to improve the output of the light emitting device, the heat dissipation effect of the package is not sufficient and the temperature of the light emitting device is not sufficient. Rises, causing the operating speed of the element and the deterioration of the resin around the element.
- a metal base 10 having a convex shape and a through hole formed in the thickness direction of the metal base 10 are hermetically sealed via an insulator 3 such as glass.
- a semiconductor device stem having a lead electrode 2 is used.
- the light emitting element 1 is electrically connected to the upper surface of such a stem. This is hermetically sealed with a can 11 with a window having a flange on the bottom side.
- the light-emitting device configured as described above has extremely high reliability compared to the case where a resin is used as the constituent material because the package is made of metal and the inside is hollow, preventing wire breakage and moisture resistance. Excellent heat resistance and heat dissipation. For this reason, it is possible to increase the amount of current flowing through the light emitting device to improve the output.
- An object of the present invention is to provide a thin surface-mounted light emitting device which has high reliability and can emit light with high luminance.
- the present invention provides a metal package including a light emitting element, a recess for accommodating the light emitting element, and a base having at least one through hole, and a lead electrode inserted into the through hole via an insulating member. And at least a bottom surface of the lead electrode protrudes from a bottom surface of the base portion, and is substantially coplanar with a bottom surface of the concave portion. Thereby, the mountability is good and A highly reliable light-emitting device can be obtained.
- the upper surface side of the lead electrode protrudes from the main surface of the base portion, because the accuracy of wire bonding is improved.
- the thickness of the base portion is larger than the bottom thickness of the concave portion.
- the inner wall of the concave portion has a tapered shape, whereby the light extraction efficiency from the light emitting element is further improved.
- a light-transmitting sealing member that covers the light-emitting element is provided in the recess, and a part of light from the light-emitting element is absorbed in the sealing member to emit light of a different wavelength. It is characterized by containing a fluorescent substance.
- the concave portion provided in a part of the metal package used in the present invention has a minimum volume capable of accommodating a light emitting element and has excellent heat dissipation. Even when used, a large current can be dropped.
- a translucent member By arranging the translucent member around the light-emitting element, a light can be collected and emitted with high luminance, and a highly reliable color conversion light-emitting device can be obtained.
- a lid made of a translucent window portion and a metal portion is provided on the main surface side of the metal package, and the translucent window portion faces the concave portion and intersects with an extension of an inner wall of the concave portion. It is characterized by Thereby, light emitted from the light emitting element and reflected and scattered by the inner wall of the concave portion can be efficiently extracted to the outside.
- the metal package has a thermal conductivity of 1 O WZm ⁇ K or more and 10 O WZm ⁇ K or less and a thermal expansion coefficient of 0.05 X 10 4 ⁇ 4 Zdeg or more and 0.20 xl O _ 4 Zdeg. It is characterized as follows. As a result, a light emitting device capable of dropping a large current without losing reliability can be obtained.
- the recess has an edge protruding from an adjacent base.
- the translucent window portion is provided on an inner wall of the concave portion facing one side surface of the light emitting element. It is characterized by intersecting an extension of a straight line connecting the inflection point, which is a rising point, and the uppermost end point of the inner wall of the recess facing the inflection point via the light emitting element.
- the light emitting device of the present invention includes a metal package having a light emitting element, a thin part on which the light emitting element is mounted, and a thick part extending from the thin part to the outside, and an insulating member on the thick part.
- the thin portion main surface is substantially parallel to the thick portion main surface, and the boundary main surface is bent. Thereby, the difference in thermal resistance between the thin portion and the thick portion is increased, and the heat dissipation is further improved.
- FIG. 1 is a schematic plan view and a schematic sectional view showing a light emitting device of the present invention.
- FIG. 2 is a schematic plan view and a schematic sectional view showing another light emitting device of the present invention.
- FIG. 3 is a schematic plan view and a schematic sectional view showing another light emitting device of the present invention.
- FIG. 4 is a schematic sectional view showing another light emitting device of the present invention.
- FIG. 5 is a schematic sectional view showing another light emitting device of the present invention.
- FIG. 6 is a schematic sectional view showing another light emitting device of the present invention.
- FIG. 7 is a schematic sectional view showing another light emitting device of the present invention.
- FIG. 8 is a schematic sectional view showing another light emitting device of the present invention.
- FIG. 9 (a) is a schematic plan view showing another light emitting device of the present invention.
- FIG. 9 (b) is a schematic cross-sectional view taken along line AA ′ of FIG. 9 (a).
- FIG. 10 is a schematic sectional view showing another light emitting device of the present invention.
- FIG. 11 is also a schematic diagram showing one step of forming the light emitting device of FIG.
- FIG. 12 is a schematic sectional view of a light emitting device shown for comparison with the present invention.
- FIG. 13 is a schematic sectional view of a light emitting device shown for comparison with the present invention.
- FIG. 14 is a schematic diagram showing a device used in one step of forming the light emitting device of FIG.
- FIG. 15 is a schematic plan view in which one light emitting device of the present invention is mounted on a high heat conductive substrate.
- FIG. 5 shows a light emitting device according to an embodiment of the present invention.
- the package 5 is made of metal, and has a concave portion a for accommodating the light emitting element in the center. Further, the base portion b, which is a peripheral portion of the concave portion, has two through holes penetrating in the thickness direction, and the respective through holes are opposed to each other with the concave portion interposed therebetween. Positive and negative lead electrodes 2 are inserted into the through holes via hard glass, which is an insulating member 3.
- both ends of the lead electrode 2 protrude from the surface of the base portion, and the bottom surface of the lead electrode is located on substantially the same plane as the bottom surface of the concave portion.
- the surface of each member in the opening direction of the concave portion of the package is defined as a main surface, and the surface on the opposite side to the main surface is expressed as a back surface or a bottom surface.
- an LED chip serving as a light emitting element 1 is arranged in the recess, and each electrode of the LED chip is electrically connected to each lead electrode 2 by a wire 4. I do.
- the main surface of the package made conductive in this way is hermetically sealed with a lid 6 having a light-transmitting window 7.
- the translucent window 7 can contain various fluorescent substances 8 such as an inorganic fluorescent substance and an organic fluorescent substance.
- a fluorescent substance 8 is a fluorescent substance containing a rare earth element which is an inorganic fluorescent substance.
- the rare earth element-containing phosphor is selected from at least one element selected from the group consisting of Y, Lu, Sc, La, Gd, and Sm, and from the group consisting of A, Ga, and In.
- a garnet-type phosphor having at least one element.
- yttrium-aluminum oxide-based phosphor activated with cerium is preferable.
- Ce, Tb Cu, Ag, Au, Fe, Cr, Nd, Dy, Ni, Ti, Eu, Pr, etc.
- a fluorescent substance 8 capable of absorbing at least a part of light from the LED chip and emitting light of a different wavelength is contained.
- a light emitting device composed of only an inorganic substance without using an organic substance as a constituent material of a package and a binder of a fluorescent substance can prevent deterioration of components due to heat and light, and is dramatically higher. Can have reliability.
- the light-emitting element 1 is not particularly limited, but when a fluorescent substance is used, a semiconductor light-emitting element having a light-emitting layer capable of emitting an emission wavelength capable of exciting the fluorescent substance is preferable.
- a semiconductor light emitting device various semiconductors such as ZnSe and GaN can be cited, and a nitride semiconductor (In x A 1 YG a ⁇ ) capable of efficiently exciting a fluorescent substance and capable of emitting light at a short wavelength.
- X _ Y N, 0 ⁇ X, 0 ⁇ Y , X + Y ⁇ 1) are preferably exemplified.
- the nitride semiconductor may contain boron or phosphorus.
- Examples of the semiconductor structure include a homo structure having a MIS junction, a PIN junction, and a pn junction, a hetero structure, and a double hetero structure.
- Various emission wavelengths can be selected depending on the material of the semiconductor layer and the degree of mixed crystal thereof.
- a single quantum well structure or a multiple quantum well structure in which the semiconductor active layer is formed as a thin film in which a quantum effect occurs can be used.
- a nitride semiconductor When a nitride semiconductor is used, materials such as sapphire, spinel, Sic, Sic, ZnO, and GaN are preferably used for the semiconductor substrate. In order to form a nitride semiconductor having good crystallinity with good mass productivity, it is preferable to use a sapphire substrate. A nitride semiconductor can be formed on this sapphire substrate by MOCVD or the like. A buffer layer such as GaN, A1N, or GaAs is formed on a sapphire substrate, and a nitride semiconductor having a pn junction is formed thereon.
- Examples of a light emitting device having a P n junction using a nitride semiconductor include a first contact layer formed of n-type gallium nitride on a buffer layer, and a first cladding layer formed of n-type aluminum nitride-gallium on a buffer layer. Active layer made of indium nitride gallium, second cladding layer made of p-type aluminum nitride gallium, p-type gallium nitride And a double hetero structure in which the second contact layers formed by the above are sequentially laminated.
- a nitride semiconductor shows n-type conductivity without doping impurities.
- a desired n-type nitride semiconductor for example, to improve luminous efficiency, it is preferable to appropriately introduce Si, Ge, Se, Te, C, or the like as an n-type dopant.
- p-type dopants such as Zn, Mg, Be, Ca, Sr, and Ba are doped.
- a light emitting element made of a nitride semiconductor can be formed by cutting the semiconductor wafer into chips.
- the light-emitting element in order to emit white light, has a light-emitting wavelength of at least 400 nm in consideration of the complementary color relationship with the light-emitting wavelength from the fluorescent substance and the deterioration of the light-transmitting resin. It is preferably at most 530 nm, more preferably at least 420 nm and at most 490 nm. In order to further improve the excitation and luminous efficiency of the light emitting element and the fluorescent substance, respectively, it is more preferably 450 nm or more and 475 nm or less.
- the light emitting device of the present invention uses a light emitting element having a main emission wavelength in the near ultraviolet or ultraviolet region, and is capable of absorbing a part of the light from the light emitting element to emit light of another wavelength.
- a color conversion type light emitting device with less color unevenness can be obtained.
- the metal package 5 used in the light emitting device of the present embodiment includes a concave portion a for housing a light emitting element and a base portion b on which a lead electrode is arranged.
- the bottom surface of the concave portion and the bottom surface of the lead electrode are located substantially on the same plane.
- the metal package is preferably formed to be thin in consideration of the heat dissipation of the heat generated from the light-emitting element and the miniaturization of the package.
- the present inventor distinguishes a portion where a light emitting element is arranged and a portion where a lead electrode is fixed in a metal package, and sets a shape and a thickness according to the purpose in each region, thereby improving reliability. Improve the performance.
- the package used in the light emitting device of the present embodiment has a recess at the center where the light emitting element can be accommodated and heat generated from the light emitting element can be radiated well.
- the bottom surface of the concave portion is located on substantially the same plane as the mounting surface of the light emitting device, that is, the bottom surface of the lead electrode, and is configured to be in contact with the surface of the mounting substrate 27. With this configuration, a high thermal conductivity region 28 is provided separately from the wiring 29 on the surface of the mounting substrate 27, and the high thermal conductivity region 28 and the bottom surface of the concave portion are fixed by a conductive member.
- the support is also fixed to the high heat conductive region 28 with a conductive member, similarly to the bottom of the concave portion.
- the thickness of the bottom surface of the concave portion is formed to be thinner than the base portion corresponding to the outer peripheral portion so as to have good heat dissipation.
- the thickness of the thin portion which is the bottom surface of the concave portion, is preferably from 0.05 mm to 0.2 mm, and more preferably from 0.05 mm to 0.1 mm.
- the bottom surface of the concave portion set in this manner is preferably low in thermal resistance.
- the light emitting device of the present invention allows heat generated from the light emitting element to be directly radiated to the mounting substrate through a heat radiation path shorter than the region where the thermal resistance is set to be lower from the outside, and realizes a lower thermal resistance. are doing.
- the main surface of the thin portion which is the bottom surface of the concave portion is substantially parallel to the main surface of the thick portion which is the base portion, and the inner wall of the concave portion which is the main surface of the boundary portion is bent. Thereby, the thin portion and The difference in thermal resistance from the thick portion is increased, and the heat dissipation can be further improved.
- the recess is preferably located at the center of the light emitting device, whereby good directional characteristics are obtained.
- the recess has a volume capable of accommodating the entire light emitting element.
- light emitted from the four side surfaces of the light emitting element can be favorably extracted in the front direction from the inner wall of the recess. This is preferable because unevenness of light emission and color unevenness particularly observed in a light emitting element made of a nitride semiconductor can be improved.
- the wavelength of the light emitting element is converted by using the color conversion layer, the entire light emitting element arranged in the concave portion can be easily covered with the color conversion layer.
- a light-transmitting member that covers the light-emitting element is provided in the concave portion because light extraction efficiency is improved.
- the light emission is performed by the color conversion layer in which the translucent member contains a fluorescent substance capable of absorbing a part of light emitted from the light emitting element and emitting another wavelength.
- the element is covered.
- the metal package used in the present invention is particularly excellent in heat dissipation in the concave portion in which the light emitting element is arranged, so that each component of the color conversion layer is not limited to an inorganic material, and an organic material can be used. Thus, the organic material hardly deteriorates, and good optical characteristics can be obtained.
- the inner wall of the recess is preferably tapered so that the volume increases toward the opening, so that a light emitting device capable of emitting light with higher luminance can be obtained.
- the back surface of the concave portion on the outer wall side has an inverted convex shape, and preferably has a groove between the bottom surface of the concave portion and the bottom surface of the lead electrode.
- the solder adhered to the bottom surface of the lead may adhere to the adjacent base portion and the like, and insulation between the electrodes may not be obtained, resulting in a short circuit.
- the recess is formed, for example, by subjecting a flat metal plate to drawing.
- drawing is performed from the main surface direction of the metal flat plate to flow the metal in the rear direction to form a concave portion.
- this flowed metal is a part of the bottom surface of the recess, the area of the mounting surface can be increased, and the thickness of the bottom surface of the side surface of the recess can be increased.
- the thickness of the concave portion forming the mounting surface is such that the light emitting element mounting portion whose main surface is flat is thin, and the main surface side is a part of the side wall of the concave portion.
- the part is configured thick. This is preferable because heat dissipation is improved and the mechanical strength of the package is increased.
- mounting can be performed with high accuracy, and favorable directional characteristics can be obtained.
- a flat plate portion surrounding the recess a in the metal package is referred to as a base portion.
- the base portion has at least one through hole penetrated in the thickness direction.
- the through hole is for fixing a lead electrode
- the light emitting device of the present embodiment has two of the through holes.
- the respective through holes are provided to face each other with the concave portion a interposed therebetween, and a positive or negative lead electrode is inserted into each of them through an insulator.
- At least one of the positive and negative lead electrodes of the light emitting device of the present invention only needs to be inserted into the through hole of the base via an insulator, and as shown in FIG. It may be formed integrally with the metal package.
- the heat generating source is made of a continuous material without an insulator from the light emitting element arrangement surface of the package concave portion to the other lead electrode, heat is well dispersed, Heat can be satisfactorily radiated from the bottom surface of the concave portion, the bottom surface of the other lead electrode, and the back surface therebetween.
- the thickness of the base portion of the metal package is larger than the bottom thickness of the concave portion.
- the thickness of the base portion is preferably from 0.3 mm to 1.0 mm, and more preferably from 0.5 mm to 1.0 mm. If the thickness is less than 0.3 mm, the strength of the entire package is reduced. In addition, cracks may occur at the weld interface due to stress strain generated during welding with the lid, and if the airtightness is imperfect, moisture will enter the interior and corrode the wires and light emitting elements, reducing reliability. Resulting in. If the thickness is 1.0 mm or more, it is difficult for the pulse current to be transmitted to the welding interface, and the sealing may be incomplete. In addition, the light emitting device becomes thicker and costs increase Will be higher.
- the outer edge of the base has a flange along the bottom of the base.
- the package end surface exposed by providing the flange portion and the inner wall of the lid disposed on the light emitting surface side, and the upper surface of the flange portion and the upper surface of the lid are fitted to each other, and positioning of these components is performed. It is preferable because it can be easily performed and mass productivity is improved.
- a support may be provided on the back side of the base portion. It is preferable that the support members are arranged at equal intervals between the lead electrodes projecting from the rear surface side, because the mounting stability of the light emitting device is improved. It is preferable that the support is made of the same material as that of the base portion, so that the heat dissipation of the light emitting device is improved. Such a support can be easily formed by, for example, performing press working from the main surface side of the base portion and flowing a part of the metal to the back surface side.
- the thermal conductivity of the lead electrode and the metal package is preferably in the range of 1 OW / mK or more and 10 OWZmK or less, more preferably 15 WZmK or more and 80 W / m ⁇ K or less, more preferably 15 W / m ⁇ K or more and 50 W / m ⁇ K or less.
- a light emitting device capable of dropping a large current for a long time while maintaining reliability can be obtained.
- the coefficient of thermal expansion of the metal package is preferably the same value as the coefficient of thermal expansion of the insulating member or a value larger than that.
- the members can be thermally adhered to each other without being damaged.
- the difference between these thermal expansion coefficients to zero. 0 1 if X 1 0- 4 Bruno deg or less, to avoid damage due to a difference in thermal expansion coefficient by increasing as much as possible the contact area of each other
- the metal package is moderately shrunk toward the inside of the through-hole by the effect of the difference in the coefficient of thermal expansion. It can be in close contact. This simplifies the working process and provides a luminous measure with good productivity.
- the base material of the metal package preferably has a strong strength.
- a thin package can be formed with high reliability.
- Preferred substrates for metal packages include Kovar, iron, and the like.
- Kovar is a Fe—Ni—Co alloy and has a coefficient of thermal expansion similar to that of a low-melting glass used for an insulating member, so that good hermetic sealing can be performed.
- Ag plating it is preferable to apply Ag plating to the outermost surface of these substrates. With this configuration, the light reflection / scattering coefficient of the package surface is improved, and the Ag layer is used as a brazing filler metal, and the adhesion between the light emitting element, the wire, and the lid and the metal package body is improved, which is preferable.
- the main surface side of the package, to which light from the light emitting element is irradiated has a glossy Ag layer, and only the portion of the Ag layer desired to enhance adhesion with other members has a dull gloss. These effects are multiplied.
- the metal package used in the present invention is configured as described above, whereby a highly reliable light emitting device can be obtained at low cost.
- the light emitting device of the present invention has positive and negative lead electrodes, at least one of which is provided integrally with the base of the metal package via an insulating member.
- a through hole is provided in the base portion, and inserted into the through hole via an insulating member.
- the tip of the lead electrode protrudes from the surface of the base, and the bottom surface of the lead electrode is located on substantially the same plane as the bottom surface of the recess on the mounting surface side.
- Top a wire connection surface of the lead electrode 2, 0. 0 2 mm 2 ⁇ 0 .
- a small-sized light emitting device with good wire bonding accuracy can be obtained.
- the bottom surface on the mounting surface side of the lead electrode protrudes from the back surface of the base portion, the bottom surface can be configured to have a larger area than the top surface.
- the lead electrode also functions as a support for the light emitting device, and can be stably mounted on the surface, and has a large contact area with the mounting substrate, so that heat dissipation is improved. Be improved.
- a lead electrode having such a shape can be obtained by, for example, pressing the bottom surface of a pillar-shaped lead electrode.
- Preferred shapes on the bottom side of the lead electrode include an inverted T shape, a divergent shape, and an inverted taper type. No.
- the light emitting device of the present embodiment has a light transmitting window portion 7 and a lid 6 formed of a metal portion on the main surface side of the metal package.
- the window 7 is a light-emitting surface of the light-emitting device, and is preferably disposed at the center.
- the window is located on an upper surface of the light emitting element arranged in the recess of the metal package, and has an intersection with an extension of an inner wall of the recess.
- Light emitted from the end of the light emitting element is reflected and scattered on the side surface of the concave portion and is taken out in the front direction. It is considered that the range of existence of these reflected and scattered light is substantially within the extension of the side surface of the concave portion. Therefore, by adjusting the area of the window portion, which is a light emitting surface, as described above, the reflected and scattered light is efficiently condensed on the window portion, and a light emitting device capable of emitting high-intensity light is provided. can get.
- the base material of the lid preferably has a thermal expansion coefficient similar to that of the light-transmitting members of the package body and the window.
- the surface of the material of the lid preferably has a Ni plating layer as a protective film of the base material.
- the above-mentioned lid is, for example, airtightly and insulated from the glass and the lid main body by arranging a tablet-shaped glass in an opening formed in the lid main body using a carbon sealing jig and letting the furnace pass therethrough. Can be worn.
- the shape of the lid is not particularly limited as long as it has a smooth flat surface that can be in close contact with the welded portion of the package and can hermetically seal the package.
- a lid having a convex central portion When a lid having a convex central portion is used, a color conversion member can be satisfactorily bound to the back of the window of the lid, and a light emitting device can be formed with a high yield.
- a flexible member is injected into the protruded rim, and a light emitting element electrically connected to the metal package is inserted and integrated, a light emitting device having excellent heat stress can be obtained.
- the surface of the window portion has a curved lens shape as shown in FIG. 7, light convergence is improved, and a light emitting device having a high luminous intensity in the front direction can be obtained.
- a light emitting device having a high luminous intensity in the front direction.
- a fluorescent substance having a directivity angle set to about 45 degrees and a fluorescent substance that absorbs a part of the blue light and emits yellow light is fixed on the back surface.
- the cannonball side When a lens is mounted, a miniaturized light emitting device capable of emitting a white beam with high luminance by mixing these colors can be obtained.
- Such a light emitting device can be used for a flash required for a drawing function provided in a small machine such as a mobile phone.
- the light-emitting device of the present invention provides light having a desired color tone by combining a light-emitting element and a fluorescent substance capable of absorbing at least a part of light emitted from the light-emitting element and emitting another light. Can be obtained.
- the fluorescent substance has compatibility with other members such as a diffusing agent and a pigment, and it is also possible to use them in combination.
- the member of the window part of the lid may contain another substance such as the fluorescent substance 8, or the other substance layer may be applied to the inner surface of the window part using a binder. Good. Further, it may be disposed in a concave portion of the metal package while being contained in a resin or the like.
- the fluorescent substance used in the present embodiment will be described in detail.
- a yttrium / aluminum oxide fluorescent material activated by cerium which can emit light by exciting light emitted from a semiconductor light emitting element having a nitride semiconductor as a light emitting layer, is used.
- the base fluorescent material is used.
- yttrium aluminum oxide fluorescent substance YA 10 3: Ce Y 3 A 1 5 0 12: C e (YAG: C e) and Y 4 A 1 2 ⁇ 9: C e, even these And the like.
- At least one of BaSrMgCaZn may be contained in the yttrium or aluminum oxide-based fluorescent substance.
- Si the reaction of crystal growth can be suppressed and the particles of the fluorescent substance can be made uniform.
- the yttrium-aluminum oxide-based phosphor activated by Ce is to be interpreted in a particularly broad sense, and part or all of yttrium is selected from the group consisting of LuScLaGd and Sm. It is used in a broad sense including a phosphor which is substituted by at least one element, or a part or the whole of aluminum is substituted by either B a T or G a or In or both and has a fluorescence action.
- This fluorescent substance has a garnet structure (garnet-type structure) and is resistant to heat, light and moisture, and can make the peak of the excitation spectrum near 450 nm. Also, the emission peak is around 580 nm and has a broad emission spectrum down to 700 nm.
- the photoluminescence phosphor can increase the excitation emission efficiency in the long wavelength region of 460 nm or more by containing Gd (gadolinium) in the crystal.
- Gd gadolinium
- the emission peak wavelength shifts to a longer wavelength
- the overall emission wavelength also shifts to the longer wavelength side. That is, when a reddish emission color is required, it can be achieved by increasing the substitution amount of Gd.
- Tb Cu, Ag, Au, Fe, Cr, Nd, Dy, Co, Ni, Ti, Eu, etc. can be contained in addition to Ce.
- the emission wavelength shifts to the shorter wavelength side by replacing part of A1 with Ga. Also, by substituting a part of Y in the composition with Gd, the emission wavelength shifts to the longer wavelength side.
- substitution is preferably changed from 0.03 to 1.0. If the substitution with Gd is less than 20%, the green component is large and the red component is small, but by increasing the content of Ce, the red component can be supplemented and the desired color tone can be obtained without lowering the luminance. . With such a composition, the temperature characteristics become good and the reliability of the light emitting diode can be improved. When a photoluminescent phosphor adjusted to have many red components is used, a light-emitting device capable of emitting an intermediate color such as pink can be formed.
- Such a photoluminescent phosphor is used as a raw material for Y, Gd, Al, and Ce.
- a coprecipitated oxide obtained by calcining a solution obtained by dissolving a rare earth element of Y, Gd, and Ce in an stoichiometric ratio in an acid with oxalic acid, and aluminum oxide Are mixed to obtain a mixed raw material.
- An appropriate amount of a fluoride such as barium fluoride or ammonium fluoride is mixed into the crucible as a flux, and the mixture is baked in air at a temperature of 135 to 140 ° C.
- such a photoluminescent phosphor is obtained by mixing two or more kinds of cerium-activated yttrium-aluminum garnet (garnet-type) phosphor and other phosphors. Is also good.
- the particle size of the fluorescent substance used in the present invention is preferably in the range of 10 ⁇ m to 50m, and more preferably 15 / m to 30m. Fluorescent substances having a particle size of less than 15 m are relatively easy to form aggregates and settle down densely in the liquid resin, which reduces light transmission efficiency. In the present invention, by using such a fluorescent substance having no fluorescent substance, the hiding of light by the fluorescent substance is suppressed, and the output of the light emitting device is improved. Further, the fluorescent substance having the particle size range of the present invention has high light absorption and conversion efficiency, and has a wide excitation wavelength range. As described above, by including a large-diameter fluorescent substance having excellent optical characteristics, it is possible to satisfactorily convert and emit light around the main wavelength of the light emitting element, thereby improving mass productivity of the light emitting device. Is done.
- the particle size is a value obtained from a volume-based particle size distribution curve.
- the volume-based particle size distribution curve is obtained by measuring the particle size distribution by a laser diffraction / scattering method. Specifically, the concentration is 0.05 ° C. in an environment at a temperature of 25 ° (70% humidity: 70%). Each substance is dispersed in 5% aqueous sodium hexaphosphate solution, and the particle size range is reduced to 0.03; um to 700 m using a laser diffraction particle size distribution analyzer (SALD-200 OA). In this volume-based particle size distribution curve, this is the particle size when the integrated value is 50%, and the central particle size of the fluorescent substance used in the present invention is 15 m to 50 m.
- the fluorescent substance having the central particle diameter value is contained frequently, and the frequency value is preferably 20% to 50%.
- the frequency value is preferably 20% to 50%.
- the location of the fluorescent substance is not particularly limited, and it may be a binder on the back of the window of the lid, or may be directly contained in the material of the window of the lid.
- a fluorescent substance may be contained in an inorganic substance such as resin or glass which is relatively less deteriorated by heat, and may be filled in the package concave portion so as to cover the light emitting element. Since the package of the present invention is made of metal and has excellent heat dissipation, even if a fluorescent material is filled around the light emitting element disposed in the recess with a resin or the like, the components are almost degraded to heat. It is possible to make the most of the intrinsic action of the resin and fluorescent substance.
- an opening is provided in the lid body, and a mixture of powdered or glass-like glass and powdered fluorescent substance is placed in the opening, Batch molding by processing. As a result, a window containing a fluorescent substance is formed.
- a mixture of a glass paste and a fluorescent substance may be arranged and fired.
- the material of the binder is not particularly limited, and any of an organic substance and an inorganic substance can be used.
- a transparent resin having excellent weather resistance such as an epoxy resin, an acrylic resin, or a silicone resin is preferably used as a specific material.
- a silicone resin because it is excellent in reliability and can improve the dispersibility of the fluorescent substance.
- an elastomer-like or gel-like member is used, a light-emitting device having excellent heat resistance can be obtained.
- an inorganic substance having a coefficient of thermal expansion similar to that of the window is preferable to use as a binder because the fluorescent substance can be brought into good contact with the window.
- a sedimentation method, a sol-gel method, or the like can be used.
- fluorescent substances, silanol (S i (OE t) 3 OH), and ethanol are mixed to form a slurry, after ejecting the slurry from Bruno nozzle to the window portion of the lid, 3 0 0 at 3 silanol and S I_ ⁇ 2 and the heating time, it is possible to fix the fluorescent substance.
- an inorganic binder may be used as a binder.
- the binder is a so-called low-melting glass, which is a fine particle, preferably has a low absorption for radiation from ultraviolet to visible region and is extremely stable in a binder, and is obtained by a precipitation method.
- Alkaline earth borates, which are fine particles, are suitable.
- a binder in which the particles are ultrafine even if the melting point is high for example, silica, alumina made of Degussa, or an alkaline earth having a fine particle size obtained by a precipitation method It is preferable to use a metal-class pyrophosphate, orthophosphate or the like.
- binders can be used alone or as a mixture with one another.
- the binder is preferably wet-pulverized in a vehicle and made into a slurry to be used as a binder slurry.
- the vehicle is a high-viscosity solution obtained by dissolving a small amount of a binder in an organic solvent or deionized water.
- an organic vehicle can be obtained by adding 1 wt% of nitrocellulose as a binder to butyl acetate as an organic solvent.
- the binder slurry thus obtained contains a fluorescent substance to prepare a coating liquid.
- the amount of the slurry in the coating solution is preferably such that the total amount of the binder in the slurry is about 1 to 3% wt with respect to the amount of the fluorescent substance in the coating solution. If the amount of the binder added is too large, the luminous flux maintenance ratio tends to decrease. Therefore, it is preferable to use the binder at a minimum.
- the coating solution is applied to the back of the window, and thereafter, hot air or hot air is blown and dried. Finally, baking is performed at a temperature of 40 O: ⁇ 700 to disperse the vehicle. As a result, a phosphor layer is attached to the surface of the window with the binder.
- a diffusing agent may be contained in the color conversion member in addition to the fluorescent substance.
- a specific diffusing agent barium titanate, titanium oxide, aluminum oxide, silicon oxide and the like are preferably used. This has good directional characteristics A light emitting device is obtained.
- the diffusing agent refers to a material having a center particle diameter of 1 nm or more and less than 5.
- the diffusing agent having a length of 1 m or more and less than 5 m is preferable because light from the light emitting element and the fluorescent substance is satisfactorily irregularly reflected, and the use of a fluorescent substance having a large particle diameter can suppress color unevenness that tends to occur. Further, the half width of the light emitting spectrum can be reduced, and a light emitting device with high color purity can be obtained.
- a diffusing agent of 1 nm or more and less than 1 / m has a low interference effect on the light wavelength from the light emitting element, but has high transparency and can increase the resin viscosity without decreasing the luminous intensity.
- the color conversion member when disposing the color conversion member by potting or the like, it becomes possible to substantially uniformly disperse the fluorescent substance in the resin in the syringe and maintain the state, and it is relatively difficult to handle the large particle size. Even when a fluorescent substance is used, production can be performed with a high yield.
- the action of the diffusing agent of the present invention varies depending on the particle size range, and can be selected or used in combination according to the method of use.
- a filler may be contained in the color conversion member in addition to the fluorescent substance.
- the specific material is the same as the diffusing agent, but the central particle size is different from that of the diffusing agent.
- the filler refers to a material having a central particle size of 5 to 100 zzm.
- the wire that electrically connects the light emitting element and the external electrode can be prevented from being broken, and the bottom surface of the light emitting element and the bottom surface of the concave portion of the package can be prevented from peeling off.
- a light emitting device is obtained. Further, the fluidity of the resin can be adjusted to be constant for a long time, and the sealing member can be formed in a desired place, so that mass production can be performed with high yield.
- the filler preferably has a particle size and Z or shape similar to the fluorescent substance.
- similar particle size refers to a case where the difference between the respective center particle sizes of the respective particles is less than 20%
- both the fluorescent substance and the filler preferably have a center particle diameter of 15 m to 50 m, more preferably 20 m to 50 m. By adjusting the particle diameters in this manner, a preferable distance between each particle is obtained. Can be provided and arranged. As a result, a light extraction path is secured, and the directional characteristics can be improved while suppressing a decrease in luminous intensity due to the inclusion of a filler.
- a light emitting device of a surface mount type as shown in FIG. 1 is formed.
- LED chips monochromatic emission peak in the emission layer is 475 nm which is visible light I ⁇ 0. 2 Ga. .
- a nitride semiconductor device which have a 8 N semiconductor. More specifically, the LED chip is manufactured by flowing a TMG (trimethyl gallium) gas, a TMI (trimethyl indium) gas, a nitrogen gas and a dopant gas together with a carrier gas on a cleaned sapphire substrate, and using a nitride semiconductor by MOCVD. Can be formed by forming a film. By switching between SiH 4 and Cp 2 Mg as the dopant gas, an n-type nitride semiconductor or a p-type nitride semiconductor layer is formed.
- the element structure of the LED chip is as follows: n-type GaN layer, which is an AND nitride semiconductor; GaN layer, which is an n-type contact layer with an Si-doped n-type electrode formed on a sapphire substrate; N-type GaN layer, which is a nitride semiconductor, and then a GaN layer that constitutes a light-emitting layer, a GaN layer that constitutes a barrier layer, an InGaN layer that constitutes a well layer, and a GaN layer that constitutes a barrier layer. It has a multiple quantum well structure in which five InGaN layers are stacked.
- an A 1 GaN layer as a Mg-doped p-type cladding layer and a GaN layer as a Mg-doped p-type contact layer are sequentially laminated.
- a GaN layer is formed on the sapphire substrate at a low temperature to serve as a buffer layer.
- the p-type semiconductor is annealed at 400 ° C or higher after film formation.
- a metal thin film is formed as a translucent electrode on the entire surface of the P-type nitride semiconductor, and then a pedestal electrode is formed on a part of the translucent electrode. After drawing the scribe line on the completed semiconductor wafer, it is divided by external force to form LED chips, which are semiconductor light emitting devices.
- a Kovar package which has a concave portion in the center and a base portion in which Kovar lead electrodes are inserted and fixed on both sides of the concave portion in an insulating and airtight manner.
- a NiZAg layer is provided on the surfaces of the package and the lead electrode.
- An LED chip is die-bonded with an Ag—Sn alloy into the recess of the package thus configured.
- a resin or glass containing a conductive material can be used as the joining member used for the die pond.
- the conductive material to be contained is preferably Ag, and when an Ag paste having a content of 80% to 90% is used, a light emitting device which is excellent in heat dissipation and has a small stress after bonding can be obtained.
- each electrode of the die-punched LED chip and each lead electrode exposed from the bottom surface of the package concave portion are electrically connected to each other by an Ag wire.
- the light emitting device of this embodiment does not use an organic resin as a constituent member, it is possible to use an A1 wire.
- the concave portion of the package is sealed with a lid made of Kovar having a glass window at the center, and seam welding is performed.
- the light emitting device is formed in the same manner as in Example 1 and has better heat dissipation than Example 1.
- a light-emitting device with high intensity can be obtained.
- both the reliability and the yield are improved, and a light-emitting device that can maintain high output for a long time can be obtained with a good yield.
- Example 4 when the light emitting device is formed in the same manner as in Example 2 except that only the inner wall side of the concave portion of the metal package is tapered, the light emission output and the mechanical strength are improved by 15% compared to Example 2.
- a light emitting device is formed in the same manner as in Example 3 except that a fluorescent substance is contained in the window of the lid.
- a solution in which rare earth elements of Y, Gd, and Ce are dissolved in an stoichiometric ratio in an acid is coprecipitated with oxalic acid.
- a co-precipitated oxide obtained by calcining this is mixed with aluminum oxide to obtain a mixed raw material.
- This is mixed with barium fluoride as a flux, packed in a crucible, and fired in air at 1400 ° C for 3 hours to obtain a fired product.
- the fired product is ball in water, washed, separated, dried, median particle size through the last sieve are the 22 (Y 0 995 Gd 0 005 ..) 2.
- C e 0 250 fluorescence Forms a substance.
- the fluorescent substance thus obtained and the powdery silica are mixed at a ratio of 1: 2, placed in an opening provided in the lid, and molded at once by press working.
- the color conversion type light-emitting device obtained in this way has the same effects as in Example 1, and can emit white light with high reliability and high output.
- Example 6 When a light emitting device is formed in the same manner as in Example 6 except that the color conversion member is formed of a silicone resin containing 5% by weight of a fluorescent substance, the same effect as in Example 6 can be obtained.
- a light emitting device was formed in the same manner as in Example 6 except that the color conversion member was coated with a silica gel containing 5 O wt% of a fluorescent substance to form a color conversion member. The effect of is obtained.
- a light emitting device When a light emitting device is formed in the same manner as in Example 3 except that the color conversion member is formed by filling the concave portion of the package with a silicone resin containing a fluorescent substance, a light emitting device having a higher front luminous intensity than Example 5 is obtained. Further, by coating the light emitting element with a resin, the point light source can be used as a surface light source, and the color mixing of light is excellent, so that uniform light emission without color variation due to angles can be obtained. When an elastomer-like silicone resin or a gel-like silicone resin is used as the silicone resin, a light emitting device excellent in heat stress can be obtained, and reliability is improved.
- a light emitting device of a surface mount type as shown in FIG. 9 is formed. With the center of the base plate made of iron, with the tapered mold installed on the back side, drawing is performed from the main surface direction to flow the metal to the back surface and the main surface, and the thickness of the base A concave portion having a thin bottom surface thickness, an edge protruding from the adjacent base portion on the main surface side, and a tapered inner wall is integrally formed. By forming in this manner, a light emitting device having excellent reliability and light extraction efficiency can be obtained with high mass productivity.
- a T-shaped lead electrode whose area on the main surface side is larger than the area on the bottom surface side is formed with a Kovar, and Ni ZAu plating is applied to the surface.
- the lead electrode thus formed is inserted into the through hole from the main surface side.
- the above-mentioned lead electrode is Because of this, positioning is easy when inserting into the through hole, and the lead electrode can be fixed with high accuracy.
- the main surface side of the lead electrode is fixed to a carbon jig having a concave portion corresponding to the main surface size, glass is applied to the interface between the through hole and the lead electrode, and the glass is melted. Is hermetically sealed.
- the area of the main surface of the lead electrode is designed to be large, it can be fixed to the carbon jig with high stability. Thereby, the hermetic sealing of the interface can be performed accurately.
- the main surface of the package is hermetically sealed with nitrogen gas. Thereby, migration of metal is prevented on the main surface side, and the area of the main surface side of the lead electrode can be maximized.
- the stitch bonding portion can be reinforced with another metal piece.
- a reinforcing pole is formed with a separate wire so as to cover at least a part of the first stitch bonding, and the wire is directly used as it is. Pull up to the top and move to the opposite side of the wire connected to the LED chip through the center of the reinforcing pole, and use the second stitch to cover the first stitch bonding via the reinforcing pole Bond and cut the wire.
- a reinforcing metal piece is configured such that a second pole bonding portion and a second stitch bonding are all arranged in one direction on a first stitch bonding portion.
- the weight and ultrasonic application by each bonding that is, the total of three times of weight and ultrasonic application are intensively applied, and the adhesion strength to the lead electrode can be increased.
- the first stitch bonding portion and the second stitch bonding portion are preferably substantially symmetrical via the reinforcing ball, whereby the first stitch bonding portion and the second stitch bonding portion are formed.
- the thickness of the second ball bonding portion interposed between the second stitch bonding and the thickness of the second ball bonding portion can be substantially uniform, and the weight and the ultrasonic application by the second stitch bonding can be uniformly transmitted over the entire surface in the one direction. Bonding strength can be enhanced. By performing such bonding reinforcement, high reliability can be maintained even when each bonding condition is not good.
- the surface area of the lead electrode can be increased, a plurality of wires can be accurately bonded on the surface of each lead electrode.
- a large-chip type light-emitting element having a plurality of light-emitting regions can emit light at a high output by applying a large current.
- a protective element is separately mounted on the base for the purpose of increasing the electrostatic withstand voltage of the light emitting element, the light emitting element and the protective element are each wire-bonded to the lead electrode, and one lead is formed.
- the respective lead electrodes are arranged along one end surface of the package.
- this configuration it is possible to simplify the electrode wiring of the mounting board and to widen the area for radiating heat.
- there is a wide variety of mounting patterns which is preferable.
- the protection element be mounted between the lead electrodes along the one end surface. Thereby, the length of the wire bonded from the protection element to the main surface of each of the lead electrodes can be made as short as possible, and the reliability can be increased without adversely affecting the optical characteristics.
- the main surface of the edge of the concave portion is located substantially on the same plane as the main surface of each of the lead electrodes, whereby the accuracy of wire bonding can be increased, and the thinning with high reliability is achieved. A light emitting device is obtained.
- a main surface of an edge portion located between the concave portion and each of the lead electrodes is configured to be lower than the main surface of the base portion, Further, it is preferable that the corner formed by the main surface and the inner wall be rounded. Thereby, the loop height of the wire can be further reduced, and both improvement in luminance and reduction in thickness can be realized. Partly like this The edge whose height has been adjusted can be integrally formed by press working when forming the concave portion.
- a support is formed by pressing the main surface side at two places opposing each of the lead electrodes via the concave portion and flowing a part of the metal to the bottom side.
- the bottom surface of the support is located on substantially the same plane as the bottom surface of the lead electrode and the bottom surface of the concave portion.
- An LED chip having two positive and negative electrodes on the same surface side is die-bonded with an Ag—Sn alloy into the concave portion of the package thus configured. It is preferable that the LED chip is mounted such that the side surface that emits light faces the protruding edge of the concave portion.
- the chip is mounted so that the corner of the chip faces each of the lead electrodes.
- the light emitting device can be made thinner without lowering the light extraction efficiency.
- the two positive electrodes of the LED chip are electrically conductive with the main surface of one lead electrode and the Au wire, respectively, and the two negative electrodes are respectively connected with the main surface of the other lead electrode and the Au wire. Take conductivity.
- a light emitting device having two or more electrodes has excellent light emission output, but relatively large amount of heat is generated.However, since the package of the present invention has excellent heat dissipation, reliability may be impaired.
- a high-power light-emitting device can be formed without using a light-emitting device.
- each lead electrode since the area of the main surface side of each lead electrode is formed large, a plurality of wires can be bonded with high reliability.
- each lead electrode since each lead electrode is arranged on one end side, even if the main area of the lead electrode is further increased as required, the package needs to be increased in only one direction, and the Enlargement can be minimized.
- the LED chip and the wire are covered with a Kovar lid having a glass window at the center, and hermetically sealed with nitrogen gas to perform seam welding.
- the glass window preferably intersects with an extension of the inner wall of the concave portion. Furthermore, a rising point of the inner wall facing a side surface of the light emitting element and a rising point of the inner wall facing the light emitting element via the light emitting element. It is preferable that they intersect with the straight line connecting the uppermost point.
- the light-emitting device thus obtained has a higher light-emitting output and mechanical strength than Example 3.
- LED chips of the surface and on the plane of the recess similar to the actual ⁇ 5 fluorescent substance 8 is a light emitting element (Y 0. 9 9 5 G d 0. 0 0 5) 2. 7 5 0 a 1 5 0 1 2: . C e 0 2 5 0 and a color conversion layer contiguous with S I_ ⁇ 2, except for forming by spray coating, forming a light-emitting device in the same manner as in example 1 0 I do.
- a method of forming the color conversion layer will be described in detail.
- a solution in which sol-type ethyl silicate, ethylene glycol and a fluorescent substance are mixed at a weight ratio of 1: 1: 1 is stirred to prepare a coating solution.
- sol-type ethyl silicate is easily dried, gelation can be prevented by mixing with a high-boiling point organic solvent (100 ° C: up to 200 ° C) such as ethanol and ethylene glycol. Is preferred.
- a high-boiling point organic solvent such as ethanol and ethylene glycol.
- the coating liquid is put into the container 18 and the coating liquid is conveyed from the container to the nozzle 17 by the circulation pump 20.
- the flow rate of the coating solution is adjusted by the valve 19.
- the mist-like application liquid ejected from the nozzle 17 is sprayed while being mist-like and spirally rotated.
- the spray spreads conically near the nozzle, and spreads cylindrically away from the nozzle.
- the top, side, and All of the corners and the corners can be covered with a continuous color conversion layer having substantially the same thickness and a uniform dispersion of the fluorescent substance, thereby improving color unevenness such as blue ring.
- the color conversion layer is preferably composed of a single particle layer, whereby the light extraction efficiency is improved.
- the distance from the upper surface of the light emitting element to the lower end of the nozzle is set to 40 to 50 mm, and the light emitting element is installed so that the surface of the light emitting element comes in a state where the spray is spread in a cylindrical shape, as shown in FIG.
- the coating solution and the gas form a continuous color conversion layer having a substantially uniform film thickness on the upper surface, side surfaces and corners of the light emitting element, and on the inner surface of the concave portion.
- the above-mentioned step is characterized in that the step of applying is carried out in a heated state.
- the step of applying is carried out in a heated state.
- the ethanol and the solvent generated by the solification of the ethyl silicate can be blown out instantaneously when sprayed onto the light emitting element.
- the color conversion layer can be provided without adversely affecting the light emitting element.
- the spray coating is performed while the package on the heater 15 is placed, and the temperature over the entire day is adjusted to a temperature of 5 Ot or more and 30 O or less. preferable.
- step 2 After the step 2 was allowed to stand at room temperature, a reaction of the water sol Echirushirigeto in the air, the fluorescent material is fixed by S i 0 2.
- an alkyl silicide that can be fixed to the light emitting device surface at a temperature of 300 It can be preferably used as a fixing agent for a fluorescent substance.
- the light-emitting device configured as described above is entirely made of an inorganic material, it has high heat dissipation and excellent light resistance to myopia and ultraviolet rays.
- any element such as a light emitting element that emits light in the ultraviolet region can be used.
- Example 1 2 any element such as a light emitting element that emits light in the ultraviolet region can be used.
- the first phosphor (Y 0 9 9 5 G d 0 0 0 5..) 2 7 5 0 A 1 5 ⁇ 1 2:. C e. 2 5 .
- the second phosphor C a ⁇ 8 E u 0. Except that are use the 2 S i 5 that the N 8 were mixed and dispersed, to form a light emitting device in the same manner as in Example 1 1, Example 1 Color rendering from 1 Thus, a light emitting device having excellent properties can be obtained.
- the second fluorescent substance that can be used in the present embodiment is not particularly limited, but MxS having an excitation wavelength similar to that of the first fluorescent substance and capable of emitting yellow to red fluorescence.
- PTFE fluororesin
- an LED chip dominant wavelength is 400 nm
- a light emitting device is formed in the same manner as in Example 11 except for the above.
- the above-mentioned raw materials are weighed and dry-mixed sufficiently by a mixer such as a ball mill.
- This mixed raw material is packed in a crucible made of SiC, quartz, alumina, or the like, heated to 1200 at a rate of 96 / hr in a reducing atmosphere of N 2 and H 2 , and fired in a constant temperature section 120 for 3 hours.
- the obtained calcined product is pulverized, dispersed, sieved, separated, washed with water and dried in water to obtain a desired phosphor powder.
- CaHP_ ⁇ as a raw material 4, C AC_ ⁇ 3, Eu 2 0 3, MnC_ ⁇ 3, NH 4 C 1, Oyo With fine NH 4 B r (Ca 0. 93, Eu 0 .. 5, Mn 0. 02) 10 (P0 4) 6 B r 0 C 1 Mr. Adjust and mix so that the composition ratio becomes
- the above-mentioned raw materials are weighed and dry-mixed sufficiently by a mixer such as a ball mill.
- This raw material is packed in a crucible made of SiC, quartz, alumina, etc., heated to 1200 at 960 ° CZhr in a reducing atmosphere of N 2 and H 2 , and fired in a constant temperature section 1200 for 3 hours.
- the obtained fired product is pulverized, dispersed, sieved, separated, washed with water, and dried in water to obtain a desired phosphor powder.
- a light emitting device capable of emitting light with high luminance can be obtained by forming a color conversion layer by applying the color conversion layer around the light emitting element and the inner surface of the recess in the same manner as in Example 14 except that this fluorescent substance is used.
- a white light source capable of emitting light with high luminance is obtained.
- the refractive index of the first color conversion layer can be set to be smaller than the refractive index of the second color conversion layer ⁇ the refractive index of the gallium nitride-based compound semiconductor layer. As a result, a light emitting device capable of emitting light with high output can be obtained.
- the light emitting device of the present invention uses a highly reliable metal package and is configured so that the portion where the light emitting element is arranged is in contact with the mounting board, so that the heat radiation is dramatically improved and a large current is dropped. High reliability can be maintained without deterioration You. This makes it possible to realize a light-emitting device that is highly reliable and can emit light of the same brightness as illumination for a long time, and has extremely high industrial utility value.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
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US10/475,001 US7019335B2 (en) | 2001-04-17 | 2002-04-16 | Light-emitting apparatus |
JP2002586412A JP3891115B2 (ja) | 2001-04-17 | 2002-04-16 | 発光装置 |
US11/123,109 US7256468B2 (en) | 2001-04-17 | 2005-05-06 | Light emitting device |
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JP2001118568 | 2001-04-17 | ||
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JP2002024208 | 2002-01-31 |
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US10475001 A-371-Of-International | 2002-04-16 | ||
US11/123,109 Division US7256468B2 (en) | 2001-04-17 | 2005-05-06 | Light emitting device |
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WO2002089219A1 true WO2002089219A1 (fr) | 2002-11-07 |
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PCT/JP2002/003759 WO2002089219A1 (fr) | 2001-04-17 | 2002-04-16 | Appareil electroluminescent |
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US (2) | US7019335B2 (ja) |
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Cited By (24)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2005166733A (ja) * | 2003-11-28 | 2005-06-23 | Matsushita Electric Works Ltd | 発光装置 |
JP2005255747A (ja) * | 2004-03-10 | 2005-09-22 | Fine Rubber Kenkyusho:Kk | 蛍光部材及び半導体発光装置 |
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JP3891115B2 (ja) | 2007-03-14 |
US7256468B2 (en) | 2007-08-14 |
US20050194601A1 (en) | 2005-09-08 |
US7019335B2 (en) | 2006-03-28 |
US20040120155A1 (en) | 2004-06-24 |
JPWO2002089219A1 (ja) | 2004-08-19 |
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