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AssigneesThe Trustees of Princeton University, University of Southern California
InventorsMark E. Thompson, Peter Djurovic, Sergey Lamansky, Drew Murphy, Raymond Kwong, Feras Abdel-Razzaq, Stephen R. Forrest, Marc A. Baldo, Paul E. Burrows
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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.
A composition comprising a compound of formula L2MX, wherein L and X are inequivalent monoanionic bidentate ligands, M is a metal that forms octahedral complexes, and the L ligands are coordinated to M through an sp2 hybridized carbon and a heteroatom, wherein M is selected from the group consisting of the transition metals of the third row of the transition series of the periodic table.
A composition comprising a compound of formula LL′L″M, wherein L, L′ and L″ are inequivalent monoanionic bidentate ligands, M is a metal that forms octahedral complexes, and the L, L′ and L″ ligands are coordinated to M through an sp2 hybridized carbon and a heteroatom.
A composition comprising a compound of formula LL′MX, wherein L, L′ and X are inequivalent monoanionic bidentate ligands, M is a metal that forms octahedral complexes, and the L and L′ ligands are coordinated to M through an sp2 hybridized carbon and a heteroatom.
A composition comprising a compound of formula LMXX′, wherein L, X and X′ are inequivalent monoanionic bidentate ligands, M is a metal that forms octahedral complexes, and the L ligand is coordinated to M through an sp2 hybridized carbon and a heteroatom.
Dependencies are inferred from the claim text.