Patent ID: 6358631
Filing Date: 2002-03-19
Classification: C09K,H01L,Y10S

Abstract:
A multicolor light emitting device (LED) structure, comprising:a plurality of at least a first and a second light emitting organic device (LED) stacked one upon the other, to form a layered structure, with each LED separated one from the other by a transparent conductive layer to enable each device to receive a separate bias potential to emit light through the stack, at least one of said LED's comprising an emission layer, said emission layer comprising at least one of a) a trivalent metal complex having the formula: â€ƒwherein M is a trivalent metal ion; Q are the atoms necessary to make at least one fused ring, at least one of said fused rings containing at least one nitrogen atom; L is a ligand selected from the group consisting of picolylmethylketone; substituted and unsubstituted salicylaldehyde; a group of the formula R1(O)COâ€” wherein R1 is selected from the group consisting of hydrogen, an alkyl group, an aryl group, and a heterocyclic group, each of which may be substituted with at least one substituent selected from the group consisting aryl, halogen, cyano and alkoxy; halogen; a group of the formula R1Oâ€” wherein R1 is as defined above, bistriphenyl siloxides and quinolates and derivatives thereof; p is 1 or 2 and t is 1 or 2 wherein p does not equal t; and b) a trivalent metal bridged complex having the formula: â€ƒwherein M and Q are defined as above.