Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-06-07
2005-06-07
Yamnitzky, Marie (Department: 1774)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S917000, C313S504000, C313S506000, C257S102000, C257S103000
Reexamination Certificate
active
06902830
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.
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Abdel-Razzaq Feras
Baldo Marc A.
Burrows Paul E.
Djurovic Peter
Forrest Stephen R.
Kenyon & Kenyon
The Trustees of Princeton University
The University of Southern California
Yamnitzky Marie
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