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Highly Efficient Multifunctional Phosphorescent Dendrimers Consisting of an Iridium-Complex Core and Charge-Transporting Dendrons for Organic Light-Emitting Devices

Published online by Cambridge University Press:  01 February 2011

Toshimitsu Tsuzuki ,
Nobuhiko Shirasawa ,
Toshiyasu Suzuki  and
Shizuo Tokito
Toshimitsu Tsuzuki
Affiliation:
Science and Technical Research Laboratories, Japan Broadcasting Corporation (NHK), 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan
Nobuhiko Shirasawa
Affiliation:
Institute for Molecular Science, Myodaiji, Okazaki, Aichi 444-8787, Japan
Toshiyasu Suzuki
Affiliation:
Institute for Molecular Science, Myodaiji, Okazaki, Aichi 444-8787, Japan
Shizuo Tokito
Affiliation:
Science and Technical Research Laboratories, Japan Broadcasting Corporation (NHK), 1-10-11 Kinuta, Setagaya-ku, Tokyo 157-8510, Japan
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Abstract

We report a novel class of emitting materials for use in the organic light-emitting devices (OLEDs): multifunctional phosphorescent dendrimers that have a phosphorescent core and have charge transporting dendrons. We have synthesized first-generation and second-generation dendrimers consisting of a fac-tris(2-phenylpyridine)iridium [Ir(ppy)3] core and hole transporting phenylcarbazole-based dendrons. Smooth amorphous films of these dendrimers were formed by spin-coating them from solutions. The OLEDs using the dendrimer exhibited bright green or yellowish-green emission from the Ir(ppy)3 core. The external quantum efficiency of the OLED using the mixture film of the first-generation dendrimer and an electron-transporting material was as high as 7.6%.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 871: Symposium I – Organic Thin-Film Electronics , 2005 , I2.8
Copyright
Copyright © Materials Research Society 2005

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