| US RE42,561 E1 | ||
| Phosphorescent organic light emitting devices | ||
| Chihaya Adachi, Fukuoka (Japan); Marc A. Baldo, Cambridge, Mass. (US); and Stephen R. Forrest, Ann Arbor, Mich. (US) | ||
| Assigned to The University of Southern California, Los Angeles, Calif. (US); and The Trustees of Princeton University, Princeton, N.J. (US) | ||
| Filed on Apr. 16, 2007, as Appl. No. 11/787,753. | ||
| Application 11/787753 is a reissue of application No. 09/629335, filed on Aug. 01, 2000, now 6,645,645, filed on Nov. 11, 2003. | ||
| Claims priority of provisional application 60/207330, filed on May 30, 2000. | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. H05B 33/14 (2006.01); H01L 51/54 (2006.01) | ||
| U.S. Cl. 428—690 [428/917; 313/504; 313/506; 257/102; 257/103; 257/E51.044] | 26 Claims |
| 1. An organic light emitting device comprising an anode, a cathode and an emissive layer, wherein the emissive layer is located
between the anode and the cathode and the emissive layer comprises an electron transporting host material doped with a phosphorescent
dopant material,
[ wherein the phosphorescent dopant material is an organometallic complex having the formula selected from L3M and L2MX, wherein
M is a third row transition metal;
L is a monoanionic bidentate ligand that is coordinated to M with an sp2 hybridized carbon and a heteroatom of the ligand L; and
X is a monoanionic bidentate ligand;]
[ and ] wherein the phosphorescent dopant material has a HOMO energy less than the ionization potential of the electron transporting
host material [ and a LUMO energy level lower than a LUMO energy level of the electron transporting host material.]
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