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. 2022 Oct 4;61(40):e202209451.
doi: 10.1002/anie.202209451. Epub 2022 Sep 2.

Au⋅⋅⋅H-C Interactions Support a Robust Thermally Activated Delayed Fluorescence (TADF) Gold(I) Complex for OLEDs with Little Efficiency Roll-Off and Good Stability

Xingyu Feng  1 , Jian-Gong Yang  1   2 , Jingsheng Miao  1 , Cheng Zhong  3 , Xiaojun Yin  1 , Nengquan Li  1 , Chao Wu  1 , Qizheng Zhang  1 , Yong Chen  4 , Kai Li  1 , Chuluo Yang  1
Affiliations

Au⋅⋅⋅H-C Interactions Support a Robust Thermally Activated Delayed Fluorescence (TADF) Gold(I) Complex for OLEDs with Little Efficiency Roll-Off and Good Stability

Xingyu Feng et al. Angew Chem Int Ed Engl. .

Abstract

The practical use of luminescent mononuclear gold(I) complexes as optoelectronic materials has been limited by their inferior stability. Herein we demonstrate a strategy to improve the stability of gold(I) complexes which display thermally activated delayed fluorescence (TADF). A highly rigid and groove-like σ-donating aryl ligand has been used to form dual Au⋅⋅⋅H-C hydrogen bonds. The secondary metal-ligand interactions have been authenticated by single-crystal structure, NMR spectroscopy and theoretical simulations. The TADF AuI complex exhibits appealing emission properties (photoluminescence quantum yield=76 %; delayed fluorescence lifetime=1.2 μs) and much improved thermal and photo-stability. Vacuum-deposited organic light-emitting diodes (OLEDs) show promising electroluminescence with a maximum external quantum efficiency (EQE) over 23 % and negligible efficiency roll-off even at 10 000 cd m-2 . An estimated LT50 longer than 77 000 h with initial luminance of 100 cd m-2 reveals good operational stability. This work suggests a way for design of stable luminescent gold(I) complexes.

Keywords: Gold(I) Complexes; Luminescence; OLED; Secondary Interactions; TADF.

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