University of Southern California

Princeton University

Other

Universal Display Corporation

Drew Murphy

Mark Edward Thompson

Stephen R Forrest

Raymond Kwong

Marc A Baldo

Sergey Lamansky

Feras Abdel-Razzaq

Paul E Burrows

Peter I Djurovich

Peter Djurovic

Bin Ma

David B Knowles

Cory S Brown

Matthias Selke

Paul A Burrows

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 LMX, 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.

Organometallic complexes as phosphorescent emitters in organic LEDs

Organometallic complexes as phosphorescent emitters in organic leds

A series of organometallic complexes and the singlet oxygen sensitization properties of these complexes are provided. Complexes with acetylacetonate ligands give singlet oxygen quantum yields near unity, whether exciting the ligand-based state or the lowest energy excited state (MLCT+LC). The singlet oxygen quenching rates for these &#x3b2;-diketonate complexes are small, roughly three orders of magnitude slower than the corresponding phosphorescence quenching rate. Similar complexes were prepared with glycine or pyridine tethered to the Ir(III) center (i.e. (bsn)Ir(gly) and (bt)Ir(py)Cl, where gly=glycine, and py=pyridine). The glycine and pyridine derivatives give high singlet oxygen yields.

Organometallic complexes as singlet oxygen sensitizers

Organometallic complexes as phosphorescent emitters in organic LEDS

Organic light emitting materials and devices

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Drew Murphy