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Saturated Red‐Light‐Emitting Gold(III) Triphenylamine Dendrimers for Solution‐Processable Organic Light‐Emitting Devices
Author(s) -
Tang ManChung,
Chan Carmen KaMan,
Tsang Daniel PingKuen,
Wong YiChun,
Chan Maggie MeiYee,
Wong Keith ManChung,
Yam Vivian WingWah
Publication year - 2014
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201404313
Subject(s) - triphenylamine , phosphorescence , oled , dendrimer , materials science , electroluminescence , iridium , dopant , phosphorescent organic light emitting diode , fabrication , isoquinoline , photochemistry , optoelectronics , doping , nanotechnology , chemistry , polymer chemistry , fluorescence , organic chemistry , optics , medicine , physics , alternative medicine , layer (electronics) , pathology , catalysis
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.