Highly Efficient Multifunctional Phosphorescent Dendrimers Consisting of an Iridium-Complex Core and Charge-Transporting Dendrons for Organic Light-Emitting Devices
Autor: | Shizuo Tokito, Toshiyasu Suzuki, Toshimitsu Tsuzuki, Nobuhiko Shirasawa |
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Rok vydání: | 2005 |
Předmět: | |
Zdroj: | MRS Proceedings. 871 |
ISSN: | 1946-4274 0272-9172 |
Popis: | 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%. |
Databáze: | OpenAIRE |
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