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Design Strategy Towards Horizontally Oriented Luminescent Tetradentate‐Ligand‐Containing Gold(III) Systems
Author(s) -
Tang ManChung,
Li LokKwan,
Lai ShiuLun,
Cheung WaiLung,
Ng Maggie,
Wong ChunYin,
Chan MeiYee,
Yam Vivian WingWah
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202006911
Subject(s) - oled , dopant , phosphorescence , materials science , photoluminescence , quantum efficiency , ligand (biochemistry) , diode , optoelectronics , luminescence , dipole , coupling (piping) , nanotechnology , doping , optics , chemistry , fluorescence , organic chemistry , metallurgy , physics , layer (electronics) , biochemistry , receptor
Phosphorescent dopants are promising candidates for organic light‐emitting diodes (OLEDs). Although it has been established that the out‐coupling efficiency and overall performances of vacuum‐deposited OLEDs can be significantly improved by a horizontal orientation of the dopants, no horizontally oriented gold(III) complexes have been reported to date. Herein, a novel class of tetradentate C^C^N^N ligand‐containing gold(III) complexes with a preferential horizontal orientation successfully generated through a one‐pot reaction is reported. These complexes demonstrate high photoluminescence quantum yields of 70 % and a high horizontal dipole ratio of 0.87 in solid‐state thin films. Green‐emitting OLEDs based on these complexes operate with a maximum external quantum efficiency of 20.6 % with an estimated out‐coupling efficiency of around 30 %. A promising device stability has been achieved in the vacuum‐deposited OLEDs, with operational half‐lifetimes of around 37 500 h at 100 cd m −2 .