Design Strategy Towards Horizontally Oriented Luminescent Tetradentate‐Ligand‐Containing Gold(III) Systems

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 or...

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Published in:Angewandte Chemie International Edition 2020-11, Vol.59 (47), p.21023-21031
Main Authors: Tang, Man‐Chung, Li, Lok‐Kwan, Lai, Shiu‐Lun, Cheung, Wai‐Lung, Ng, Maggie, Wong, Chun‐Yin, Chan, Mei‐Yee, Yam, Vivian Wing‐Wah
Format: Article
Language:English
Subjects:
Coordination compounds
Coupling
Dipoles
Dopants
Efficiency
Gold
Horizontal orientation
Ligands
luminescence
nitrogen heterocycles
operational stability
Organic light emitting diodes
organic light-emitting devices
Phosphorescence
Photoluminescence
Photons
Quantum efficiency
Thin films
Vacuum
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cited_by cdi_FETCH-LOGICAL-c3871-27a56d37d023baa9edb2ba44313761a376448dcbf073570e3d9ac555d96234593
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container_title Angewandte Chemie International Edition
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creator Tang, Man‐Chung
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Yam, Vivian Wing‐Wah
description 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. A novel class of tetradentate C^C^N^N ligand‐containing gold(III) complexes with a preferential horizontal orientation has been obtained through a one‐pot reaction. A high maximum external quantum efficiency of 20.6 % has been realized in the vacuum‐deposited gold(III)‐based OLEDs, with operational half‐lifetimes of around 37 500 h at 100 cd m−2.
doi_str_mv 10.1002/anie.202006911
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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. 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source Wiley-Blackwell Journals
subjects Coordination compounds
Coupling
Dipoles
Dopants
Efficiency
Gold
Horizontal orientation
Ligands
luminescence
nitrogen heterocycles
operational stability
Organic light emitting diodes
organic light-emitting devices
Phosphorescence
Photoluminescence
Photons
Quantum efficiency
Thin films
Vacuum
title Design Strategy Towards Horizontally Oriented Luminescent Tetradentate‐Ligand‐Containing Gold(III) Systems
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