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Tetradentate Gold(III) Complexes as Thermally Activated Delayed Fluorescence (TADF) Emitters: Microwave‐Assisted Synthesis and High‐Performance OLEDs with Long Operational Lifetime
Author(s) -
Zhou Dongling,
To WaiPong,
Tong Glenna So Ming,
Cheng Gang,
Du Lili,
Phillips David Lee,
Che ChiMing
Publication year - 2020
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201914661
Subject(s) - oled , diphenylamine , fluorescence , phenoxazine , substituent , materials science , toluene , photochemistry , electroluminescence , thermal stability , ligand (biochemistry) , chemistry , nanotechnology , organic chemistry , medicine , physics , layer (electronics) , biochemistry , receptor , quantum mechanics , phenothiazine , metallurgy , pharmacology
Structurally robust tetradentate gold(III)‐emitters have potent material applications but are rare and unprecedented for those displaying thermally activated delayed fluorescence (TADF). Herein, a novel synthetic route leading to the preparation of highly emissive, charge‐neutral tetradentate [C^C^N^C] gold(III) complexes with 5‐5‐6‐membered chelate rings has been developed through microwave‐assisted C−H bond activation. These complexes show high thermal stability and with emission origin ( 3 IL, 3 ILCT, and TADF) tuned by varying the substituents of the C^C^N^C ligand. With phenoxazine/diphenylamine substituent, we prepared the first tetradentate gold(III) complexes that are TADF emitters with emission quantum yields of up to 94 % and emission lifetimes of down to 0.62 μs in deoxygenated toluene. These tetradentate Au III TADF emitters showed good performance in vacuum‐deposited OLEDs with maximum EQEs of up to 25 % and LT 95 of up to 5280 h at 100 cd m −2 .