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Smart Design on the Cyclometalated Ligands of Iridium(III) Complexes for Facile Tuning of Phosphorescence Color Spanning from Deep‐Blue to Near‐Infrared
Author(s) -
Chen Zhao,
Wang Liqi,
Ho CheukLam,
Chen Shuming,
Suramitr Songwut,
Plucksacholatarn Aunyamanee,
Zhu Nianyong,
Hangbua Supa,
Wong WaiYeung
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201800824
Subject(s) - iridium , phosphorescence , photochemistry , materials science , pyridine , infrared , conjugated system , oled , chemistry , fluorescence , nanotechnology , organic chemistry , catalysis , layer (electronics) , optics , polymer , physics , composite material
Abstract It has long been a challenge to achieve iridium(III) complexes with emission colors covering the whole visible and near‐infrared wavelengths, by using similar cyclometalating ligands. Herein, a series of iridium(III) complexes that accomplish broadly tunable phosphorescence from 420 to 729 nm through the use of trifluoromethyl substituents and other conjugated units such as [1,2,5]thiadiazolo[3,4‐ c ]pyridine in the cyclometalating ligands are reported. The peak external quantum efficiencies of 7.1%, 20.0%, 14.0%, 4.0%, and 16.0% are achieved for deep‐blue, green, red, near‐infrared, and white phosphorescent organic light‐emitting diodes, respectively, by using these iridium(III) complexes.