title: Coumarin-based, electron-trapping iridium complexes as highly efficient and stable phosphorescent emitters for organic light-emitting diodes.
abstract: A new class of coumarin-based iridium tris-cyclometalated complexes has been developed. These complexes are highly emissive, with emission colors ranging from green to orange-red. Besides modification of ligand structures, color tuning was realized by incorporation of ligands with different electrochemical properties in a heteroleptic structure. The organic light-emitting diodes (OLEDs) using these compounds as emissive dopants are highly efficient and stable. Unlike other Ir(III) phosphorescent dopants, these coumarin-based Ir(III) dopants can effectively trap and transport electrons in the emissive layer.
authors.affiliation: Research Laboratories, Eastman Kodak Company, 1999 Lake Avenue, Rochester, New York 14650-2103, USA. xiaofan.ren@kodak.com
authors.forename: Xiaofan
authors.initials: X
authors.lastname: Ren
authors.forename: Marina E
authors.initials: ME
authors.lastname: Kondakova
authors.forename: David J
authors.initials: DJ
authors.lastname: Giesen
authors.forename: Manju
authors.initials: M
authors.lastname: Rajeswaran
authors.forename: Marcel
authors.initials: M
authors.lastname: Madaras
authors.forename: William C
authors.initials: WC
authors.lastname: Lenhart
mesh_terms: D003374:Coumarins / Q000737:chemistry*; D004583:Electrons; D007468:Iodopyracet / Q000737:chemistry*; D007495:Iridium / Q000737:chemistry*; D008027:Light; D008163:Luminescent Measurements / Q000379:methods; D015394:Molecular Structure; D010777:Photochemistry / Q000379:methods; D013050:Spectrometry, Fluorescence; D013816:Thermodynamics
chemical_list: D003374:Coumarins; D007495:Iridium; C030123:coumarin; D007468:Iodopyracet