The invention describes the particles comprising an energy donor as a first component and a fluorescent dye as a second component positioned in said particles at an energy exchanging distance from one another, wherein the two components have a Stokes shift of greater than or equal to 50 nm, said particle...http://www.google.com.au/patents/US6251687?utm_source=gb-gplus-sharePatent US6251687 - Fluorescence energy transfer and intramolecular energy transfer in particles using novel compounds
