| US 7,553,560 B2 | ||
| Organometallic compounds and emission-shifting organic electrophosphorescence | ||
| Sergey Lamansky, Maplewood, Minn. (US); Mark E. Thompson, Anaheim, Calif. (US); Vadim Adamovich, Los Angeles, Calif. (US); Peter I. Djurovich, Long Beach, Calif. (US); Chihaya Adachi, Hokkaido (Japan); Marc A. Baldo, Princeton, N.J. (US); Stephen R. Forrest, Princeton, N.J. (US); and Raymond Kwong, Plainsboro, N.J. (US) | ||
| Assigned to The Trustees of Princeton University, Princeton, N.J. (US); The University of Southern California, Los Angeles, Calif. (US); and Universal Display Corporation, Ewing, N.J. (US) | ||
| Filed on May 06, 2008, as Appl. No. 12/151,455. | ||
| Application 12/151455 is a division of application No. 11/122160, filed on May 03, 2005, granted, now 7,381,479. | ||
| Application 11/122160 is a continuation of application No. 09/978455, filed on Oct. 16, 2001, granted, now 6,939,624. | ||
| Application 09/978455 is a continuation in part of application No. 09/637766, filed on Aug. 11, 2000, granted, now 6,911,271. | ||
| Claims priority of provisional application 60/283814, filed on Apr. 13, 2001. | ||
| Prior Publication US 2008/0281098 A1, Nov. 13, 2008 | ||
| Int. Cl. H01L 51/54 (2006.01); C09K 11/06 (2006.01) | ||
| U.S. Cl. 428—690 [428/917; 313/504; 257/40; 257/E51.044; 548/101; 548/103; 548/110; 548/402; 546/2; 546/5; 544/225] | 5 Claims |
| 1. An organic light emitting device having an emissive layer comprising an organometallic compound, wherein the organometallic
compound consists of
a metal having an atomic number of at least 72;
at least one mono-anionic bidentate, carbon coordination ligand bound to the metal, and at least one non mono-anionic bidentate,
carbon coordination ligand bound to the metal, wherein
the mono-anionic bidentate, carbon coordination ligand has the structure
 wherein R is halogen or alkyl, and R1, R2 and R3 are, independently, hydrogen, halogen, alkyl, or aryl, wherein at least one of R1 and R2 is hydrogen, with the proviso that the at least one mono-anionic bidentate, carbon-coordination ligand is substituted with
at least one of an electron donating substituent and an electron withdrawing substituent.
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