Saturated Red‐Light‐Emitting Gold(III) Triphenylamine Dendrimers for Solution‐Processable Organic Light‐Emitting Devices |
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| Authors: | Man‐Chung Tang Dr Carmen Ka‐Man Chan Dr Daniel Ping‐Kuen Tsang Yi‐Chun Wong Dr Maggie Mei‐Yee Chan Dr Keith Man‐Chung Wong Prof Vivian Wing‐Wah Yam |
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| Affiliation: | Department of Chemistry, The University of Hong Kong, Pokfulam Road (Hong Kong), Fax: +(852)?2857–1586, Tel: +(852)?2859–2153 |
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| Abstract: | A novel isoquinoline‐containing C^N^C ligand and its phosphorescent triphenylamine‐based alkynylgold(III) dendrimers have been synthesized. These alkynylgold(III) dendrimers serve as phosphorescent dopants in the fabrication of efficient solution‐processable organic light‐emitting devices (OLEDs). The photophysical, electrochemical, and electroluminescence properties were studied. A saturated red emission with CIE coordinates of (0.64, 0.36) and a high EQE value of 3.62 % were achieved. Unlike other red‐light‐emitting iridium(III) dendrimers, a low turn‐on voltage of less than 3 V and a reduced efficiency roll‐off at high current densities were observed; this can be accounted for by the enhanced carrier transporting ability and the relatively short lifetimes in the high‐generation dendrimers. This class of alkynylgold(III) dendrimers are promising candidates as phosphorescent dopants in the fabrication of solution‐processable OLEDs. |
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| Keywords: | dendrimers gold OLEDs phosphorescence |
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