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tris ‐Heteroleptic Cyclometalated Iridium(III) Complexes with Ambipolar or Electron Injection/Transport Features for Highly Efficient Electrophosphorescent Devices
Author(s) -
Xu Xianbin,
Yang Xiaolong,
Wu Yong,
Zhou Guijiang,
Wu Chao,
Wong WaiYeung
Publication year - 2015
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201403057
Subject(s) - phosphorescence , ambipolar diffusion , iridium , electroluminescence , oled , tris , quantum efficiency , photochemistry , chemistry , ligand (biochemistry) , electrochemistry , electron , materials science , combinatorial chemistry , optoelectronics , fluorescence , electrode , organic chemistry , physics , catalysis , optics , biochemistry , receptor , layer (electronics) , quantum mechanics
A series of tris ‐heteroleptic phosphorescent cyclometalated Ir III complexes with two different cyclometalating ligands and one ancillary ligand was synthesized. Through manipulation of the electronic features of individual cyclometalating ligands, not only the emission color and electrochemical properties of these Ir III complexes can be tuned, but also unique charge carrier injection and transport traits can be conferred to them. Owing to the enhanced electron injection/transport and ambipolar characters associated with these tris ‐heteroleptic structures, these Ir III emitters showed very impressive electroluminescent performance with a maximum external quantum efficiency of 20.20 %, luminance efficiency of 69.41 cd A −1 and power efficiency of 35.15 Lm W −1 . These results provide a new outlet to design and synthesize highly efficient electrophosphors for phosphorescent organic light‐emitting diodes.