ORGANOMETALLIC COMPLEXES AS PHOSPHORESCENT EMITTERS IN ORGANIC LEDS
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Abstract
Organic light emitting devices are described wherein the emissive layer comprises a host material containing an emissive molecule, which molecule is adapted to luminesce when a voltage is applied across the heterostructure, and the emissive molecule is selected from the group of phosphorescent organometallic complexes, including cyclometallated platinum, iridium and osmium complexes. The organic light emitting devices optionally contain an exciton blocking layer. Furthermore, improved electroluminescent efficiency in organic light emitting devices is obtained with an emitter layer comprising organometallic complexes of transition metals of formula L2MX, wherein L and X are distinct bidentate ligands. Compounds of this formula can be synthesized more facilely than in previous approaches and synthetic options allow insertion of fluorescent molecules into a phosphorescent complex, ligands to fine tune the color of emission, and ligands to trap carriers.
98 Citations
89 Claims
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1-68. -68. (canceled)
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69. An organic light emitting device comprising:
an emitter layer comprising a molecule of the formula L2MX, wherein L and X are inequivalent, bidentate ligands and M is a metal which forms octahedral complexes, and wherein the emitter layer produces an emission which has a maximum at a certain wavelength λ
max.- View Dependent Claims (71, 72, 73, 74, 77, 78, 79, 80, 81)
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70. (canceled)
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75-76. -76. (canceled)
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82. An organic light emitting device comprising:
an emitter layer comprising a molecule of the formula LL′
L″
M wherein L, L′ and
L″
are inequivalent bidentate ligands, M is a metal which forms octahedral complexes, and the molecule of the formula LL′
L″
M is phosphorescent.
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83. (canceled)
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84. A composition of formula LL′
- L″
M, wherein L, L′
, and L″
are bidentate ligands which coordinate to M and M is a metal selected from the group consisting of the third row of the transition metal group of the periodic table which forms an octahedral complex with L, L′ and
L″
. - View Dependent Claims (85, 86, 87, 88)
- L″
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89-90. -90. (canceled)
Specification