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

Autor: Wai-Lung Cheung, Maggie Ng, Lok-Kwan Li, Man-Chung Tang, Shiu-Lun Lai, Chun-Yin Wong, Mei-Yee Chan, Vivian Wing-Wah Yam
Rok vydání: 2020
Předmět:
Zdroj: Angewandte Chemie. 132:21209-21217
ISSN: 1521-3757
0044-8249
DOI: 10.1002/ange.202006911
Popis: 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 .
Databáze: OpenAIRE
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