US20060199292A1 - Process for fabricating, and light emitting device resulting from, a homogenously mixed powder/pelletized compound - Google Patents
Process for fabricating, and light emitting device resulting from, a homogenously mixed powder/pelletized compound Download PDFInfo
- Publication number
- US20060199292A1 US20060199292A1 US11/415,001 US41500106A US2006199292A1 US 20060199292 A1 US20060199292 A1 US 20060199292A1 US 41500106 A US41500106 A US 41500106A US 2006199292 A1 US2006199292 A1 US 2006199292A1
- Authority
- US
- United States
- Prior art keywords
- light emitting
- emitting device
- fabricating
- solid pellets
- molding compound
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
- C09K11/7774—Aluminates
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/10—Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L33/005—Processes
- H01L33/0095—Post-treatment of devices, e.g. annealing, recrystallisation or short-circuit elimination
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- 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
- H01L33/44—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 coatings, e.g. passivation layer or anti-reflective coating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Landscapes
- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Led Device Packages (AREA)
Abstract
The present invention comprises a process of mixing a luminous substance in powder form to a transferable grade molding compound in a pelletized or powder form, such as a clear epoxy, to derive a homogeneous mixture that can be pressed and sintered into solid pellets. The solid pellets are further processed so as to permit their deposition on and around a light emitting semiconductor driver so as to obtain a white light emitting semiconductor device. This white light emitting device can be used in a variety of lighting applications.
Description
- This application is a continuation of pending U.S. patent application Ser. No. 10/623,229 filed Jul. 18, 2003 entitled PROCESS FOR FABRICATING, AND LIGHT EMITTING DEVICE RESULTING FROM, A HOMOGENOUSLY MIXED POWDER/PELLETIZED COMPOUND, which is related to U.S. provisional patent application No. 60/397,082, filed Jul. 19, 2002, entitled PROCESS FOR PREPARING, AND DEVICE RESULTING FROM, A HOMOGENOUSLY MIXED POWDER/PELLETIZED COMPOUND FOR USE IN LIGHT EMITTING SEMICONDUCTOR DEVICES, the entire contents of which are incorporated herein by this reference. The Applicants hereby claim the benefits of this earlier pending provisional application under 35 U.S.C. Section 119(e).
- The present invention relates to processes for preparing compositions used in the fabrication of light emitting semiconductor devices, and also relates to the devices resulting from the use of said process.
- LEDs are used in a variety of applications, such as displays, illumination in control panels, in traffic lights and electronic devices. An LED is a semiconductor device that converts electrical energy into optical energy. This occurs when a forward bias is applied to the device, resulting in holes in the P-type semiconductor material combining with the electrons in the N-type semiconductor material at the P-N junction. A “white” light emitting diode uses a blue light emitting diode as the source of the light. A luminous material layered over the blue light emitting diode acts to partly absorb the blue light and convert it into yellow or yellowish green light. When mixed, the blue and yellow/yellowish green light combine as white light.
- A conventional method of producing white light emitting devices includes a process in which yttrium aluminate (“YAG”) is directly deposited onto a light emitting diode (“LED”) chip surface in order to produce LEDs that emit white light. However, a disadvantage of said process, and the resulting LED, is that the color temperature from such a white LED is not uniform over a plurality of angular positions due to the non-uniform thickness of the YAG over the LED chip surface. Further, this unequal distribution of color temperature occurs on a device by device basis within the same lot.
- In addition, at elevated drive current, bleed-through of radiation in the ultra-violet (“UV”) range can occur. The use of the conventional process in producing these “white” light emitting devices disadvantageously results in package complexity, leading to limited ruggedness and decreased reliability of the devices.
- The present invention comprises a process of mixing a luminous substance in powder form to a transferable grade molding compound in a pelletized or powder form, such as a clear epoxy, to derive a homogeneous mixture that can be pressed and sintered into solid pellets. The solid pellets are further processed so as to permit their deposition on and around a light emitting semiconductor driver so as to obtain a “white” light emitting semiconductor device. This “white” light emitting device can be used in a variety of lighting applications.
- The present invention discloses a process for adding a luminous substance in powder form to a transferable grade molding compound in pellet or powder form to derive a homogeneous mixture that can be pressed and sintered into pellets so as to obtain a “white” light emitting semiconductor device.
- In an embodiment of the invention, the luminous powdered substance is a Cerium doped garnet, such as the inorganic luminous substance YAG:Ce. In this embodiment, YAG:Ce is homogeneously admixed with a pelletized molding compound, such as a clear epoxy. Although YAG:Ce has an index of refraction of about 1.84, resulting in good mixing of blue diode emissions with yellow/yellowish green converter radiation, any type of luminous substance in powder form can be used in the disclosed process. Other luminous substance powders that can be homogenously distributed within the molding compound include but are not limited to other garnets doped with rare earths.
- The particle sizes of the luminous powdered substances are less than or equal to 5 microns and can be spherical or flake-like in shape. Different chromaticity can be obtained by adjusting the luminous powder's (i) percentage by weight of the combined material and (ii) micron size, before admixing and pelletizing. Because of the characteristics of the mixture, no sedimentation of the substance occurs and the mixture remains homogeneous. The powder and pellets must be stored in Nitrogen before and during production as they are susceptible to moisture. Because the luminous powder added to the epoxy changes its spiral flow, the transfer pressure must be increased 10% to 15% of manufacturer's recommended settings. As used with the Microsemi(r) PM3 package, a “color tunable” device can be produced. The disclosed process can also be used to convert the wavelength of blue, green or ultra-violet light of LEDs to other wavelengths.
- By providing uniformity in concentration by weight and homogeneous disposition of the luminous substance within the molding compound, uniform distribution of color temperature can be achieved. Using the disclosed process to control the percentage weight of the luminous substance, such as YAG, to the molding compound, such as a clear epoxy, ensures uniform distribution of color temperature. Furthermore, use of the disclosed process allows a more robust injection molded package. This is accomplished by depositing the admixed substance around the LED chip atop a copper lead frame Specifically, pellets are taken from a freezer and stored in Nitrogen until they reached room temperature. They are then removed from the Nitrogen box and placed in a feed bowl to be loaded into a mold shuttle for transfer. The feed bowl and mold shuttle are purged with nitrogen to keep the pellets dry. The use of this process advantageously results in no UV bleed through at elevated drive current.
- More specifically, the powder/pelletized composition includes, among other things, the following parts:
- (a) molding compound, such as a clear epoxy;
- (b) luminous substances, such as YAG:Ce;
- (c) thixotorpic agent, such as pyrogenic silicic acid, to thicken the epoxy casting resin;
- (d) mineral diffuser, such as CaF2, for optimizing the luminous pattern of the composition;
- (e) processing adjuvant, such as glycol ether or surface modifiers based on silicone, to improve the compatibility between the epoxy and the luminous substance;
- (f) hydrophobic agent, such as liquid silicone wax to modify the pigment surface; and
- (g) adhesion promoters, to improve the adhesion between the pigments and the epoxy.
- The innovative teachings of the present invention are described with particular reference to the disclosed embodiment. However, it should be understood that the embodiment provides only one example of the many advantageous uses and innovative teachings herein. Various alterations, modifications and substitutions can be made to the disclosed invention without departing in any way from the spirit and scope of the invention.
Claims (7)
1. A method of fabricating a light emitting device, comprising:
admixing a luminous substance to a transferable grade molding compound to derive a homogeneous mixture;
pressing and sintering the homogeneous mixture into solid pellets;
processing the solid pellets such that the solid pellets are adapted to be applied on a semiconductor surface; and
depositing the processed solid pellets on the semiconductor surface.
2. The method of fabricating a light emitting device of claim 1 wherein the molding compound is in a pelletized form prior to pressing and sintering the homogeneous mixture into solid pellets.
3. The method of fabricating a light emitting device of claim 1 wherein the pelletized molding compound further comprises a clear epoxy.
4. The method of fabricating a light emitting device of claim 1 wherein the molding compound is in a powdered form prior to pressing and sintering the homogeneous mixture into solid pellets.
5. The method of fabricating a light emitting device of claim 4 wherein the powdered molding compound further comprises a clear epoxy.
6. The method of fabricating a light emitting device of claim 1 wherein the luminous substance is in powdered form prior to pressing and sintering the homogeneous mixture into solid pellets.
7. The method of fabricating a light emitting device of claim 1 wherein the light emitting device is adapted to emit a white light.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/415,001 US20060199292A1 (en) | 2002-07-19 | 2006-05-01 | Process for fabricating, and light emitting device resulting from, a homogenously mixed powder/pelletized compound |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US39708202P | 2002-07-19 | 2002-07-19 | |
US10/623,229 US20040124433A1 (en) | 2002-07-19 | 2003-07-18 | Process for fabricating, and light emitting device resulting from, a homogenously mixed powder/pelletized compound |
US11/415,001 US20060199292A1 (en) | 2002-07-19 | 2006-05-01 | Process for fabricating, and light emitting device resulting from, a homogenously mixed powder/pelletized compound |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/623,229 Continuation US20040124433A1 (en) | 2002-07-19 | 2003-07-18 | Process for fabricating, and light emitting device resulting from, a homogenously mixed powder/pelletized compound |
Publications (1)
Publication Number | Publication Date |
---|---|
US20060199292A1 true US20060199292A1 (en) | 2006-09-07 |
Family
ID=30770992
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/623,229 Abandoned US20040124433A1 (en) | 2002-07-19 | 2003-07-18 | Process for fabricating, and light emitting device resulting from, a homogenously mixed powder/pelletized compound |
US11/079,323 Active 2026-12-26 US8269409B2 (en) | 2002-07-19 | 2005-03-14 | Method of fabricating a light-emitting device (LED) utilizing powder/pelletized homogeneously mixed molding compound |
US11/415,001 Abandoned US20060199292A1 (en) | 2002-07-19 | 2006-05-01 | Process for fabricating, and light emitting device resulting from, a homogenously mixed powder/pelletized compound |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/623,229 Abandoned US20040124433A1 (en) | 2002-07-19 | 2003-07-18 | Process for fabricating, and light emitting device resulting from, a homogenously mixed powder/pelletized compound |
US11/079,323 Active 2026-12-26 US8269409B2 (en) | 2002-07-19 | 2005-03-14 | Method of fabricating a light-emitting device (LED) utilizing powder/pelletized homogeneously mixed molding compound |
Country Status (3)
Country | Link |
---|---|
US (3) | US20040124433A1 (en) |
AU (1) | AU2003261181A1 (en) |
WO (1) | WO2004010472A2 (en) |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9296126B2 (en) | 2003-05-17 | 2016-03-29 | Microgreen Polymers, Inc. | Deep drawn microcellularly foamed polymeric containers made via solid-state gas impregnation thermoforming |
CN101027789B (en) * | 2004-09-23 | 2012-07-04 | 皇家飞利浦电子股份有限公司 | Light-emitting device |
US8877331B2 (en) | 2007-01-17 | 2014-11-04 | MicroGREEN Polymers | Multi-layered foamed polymeric objects having segmented and varying physical properties and related methods |
US8080194B2 (en) | 2008-06-13 | 2011-12-20 | Microgreen Polymers, Inc. | Methods and pressure vessels for solid-state microcellular processing of thermoplastic rolls or sheets |
US8827197B2 (en) | 2008-11-04 | 2014-09-09 | Microgreen Polymers Inc | Apparatus and method for interleaving polymeric roll for gas impregnation and solid-state foam processing |
EP2560818B1 (en) | 2010-04-19 | 2015-08-26 | Microgreen Polymers, Inc. | A method for joining thermoplastic polymer material |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020195935A1 (en) * | 1999-12-30 | 2002-12-26 | Harald Jager | Surface-mountable light-emitting diode light source and method of producing a light-emitting diode light source |
US6989412B2 (en) * | 2001-06-06 | 2006-01-24 | Henkel Corporation | Epoxy molding compounds containing phosphor and process for preparing such compositions |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU583423B2 (en) * | 1985-09-21 | 1989-04-27 | Semiconductor Energy Laboratory Co. Ltd. | Semiconductor device free from the electrical shortage through a semiconductor layer and method for manufacturing same |
US4708839A (en) * | 1985-12-30 | 1987-11-24 | Amphenol Corporation | Method of compressively molding articles from resin coated filler materials |
NL8802879A (en) * | 1988-11-22 | 1990-06-18 | Ireneus Johannes Theodorus Mar | METHOD FOR PACKING A CUSTOMIZED QUANTITY OF THERMO-CURING PLASTIC FOR COVERING A COMPONENT, PACKAGING OBTAINED WITH THIS METHOD, METHOD FOR OPERATING A MAT AND DIE FOR CARRYING OUT THIS PROCESS |
US5369192A (en) * | 1993-06-28 | 1994-11-29 | Minnesota Mining And Manufacturing Company | Binder resin for resin transfer molding preforms |
JPH08148280A (en) * | 1994-04-14 | 1996-06-07 | Toshiba Corp | Semiconductor device and manufacture therefor |
DE19638667C2 (en) * | 1996-09-20 | 2001-05-17 | Osram Opto Semiconductors Gmbh | Mixed-color light-emitting semiconductor component with luminescence conversion element |
TW383508B (en) * | 1996-07-29 | 2000-03-01 | Nichia Kagaku Kogyo Kk | Light emitting device and display |
US5958573A (en) * | 1997-02-10 | 1999-09-28 | Quantum Energy Technologies | Electroluminescent device having a structured particle electron conductor |
US5813753A (en) * | 1997-05-27 | 1998-09-29 | Philips Electronics North America Corporation | UV/blue led-phosphor device with efficient conversion of UV/blues light to visible light |
WO1999008321A1 (en) * | 1997-08-07 | 1999-02-18 | Matsushita Electric Works, Ltd. | Epoxy resin sealing material for molding semiconductor chip and method for manufacturing the same |
JP3877024B2 (en) * | 1998-04-13 | 2007-02-07 | 株式会社日立プラズマパテントライセンシング | Phosphor layer forming method and apparatus for plasma display panel, filamentary molded body used therefor, and method for producing the molded body |
US6203911B1 (en) * | 1998-06-17 | 2001-03-20 | E. I. Du Pont De Nemours And Company | Thermoset volatile monomer molding compositions |
-
2003
- 2003-07-18 WO PCT/US2003/022389 patent/WO2004010472A2/en not_active Application Discontinuation
- 2003-07-18 US US10/623,229 patent/US20040124433A1/en not_active Abandoned
- 2003-07-18 AU AU2003261181A patent/AU2003261181A1/en not_active Abandoned
-
2005
- 2005-03-14 US US11/079,323 patent/US8269409B2/en active Active
-
2006
- 2006-05-01 US US11/415,001 patent/US20060199292A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20020195935A1 (en) * | 1999-12-30 | 2002-12-26 | Harald Jager | Surface-mountable light-emitting diode light source and method of producing a light-emitting diode light source |
US6989412B2 (en) * | 2001-06-06 | 2006-01-24 | Henkel Corporation | Epoxy molding compounds containing phosphor and process for preparing such compositions |
Also Published As
Publication number | Publication date |
---|---|
US8269409B2 (en) | 2012-09-18 |
WO2004010472A2 (en) | 2004-01-29 |
AU2003261181A1 (en) | 2004-02-09 |
US20040124433A1 (en) | 2004-07-01 |
US20050158908A1 (en) | 2005-07-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |