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Optimization of Orange-Emitting Electrophosphorescent Copolymers for Organic Light-Emitting Diodes

โœ Scribed by Andreas Haldi; Alpay Kimyonok; Benoit Domercq; Lauren E. Hayden; Simon C. Jones; Seth R. Marder; Marcus Weck; Bernard Kippelen

Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
261 KB
Volume
18
Category
Article
ISSN
1616-301X

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โœฆ Synopsis

Abstract

Orangeโ€emitting phosphorescent copolymers containing iridium complexes and bis(carbazolyl)fluorene groups in their side chains are employed as the emissive layer in multilayer organic lightโ€emitting diodes (OLEDs). The efficiency of the OLED devices is optimized by varying characteristics of the copolymers: the molecular weight, the iridium loading level, and the nature and length of the linker between the side chains and the polymer backbone. A maximum efficiency of 4.9โ€‰ยฑโ€‰0.4%, 8.8โ€‰ยฑโ€‰0.7โ€‰cd A^โˆ’1^ at 100โ€‰cd m^โˆ’2^ is achieved with an optimized copolymer.

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## Abstract Rare redโ€fluorescent fluorene derivatives have been designed and synthesized. The longโ€wavelength red fluorescence is achieved by incorporating a di(4โ€tolyl)amino or diphenylamino electron donor and a dicyanovinyl electron acceptor. The singleโ€crystal Xโ€ray structures of the di(4โ€tolyl)