Feng Xingyu, Yang Jian-Gong, Miao Jingsheng, Zhong Cheng, Yin Xiaojun, Li Nengquan, Wu Chao, Zhang Qizheng, Chen Yong, Li Kai, Yang Chuluo
Shenzhen Key Laboratory of New Information Display and Storage Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518055, P. R. China.
College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
Angew Chem Int Ed Engl. 2022 Oct 4;61(40):e202209451. doi: 10.1002/anie.202209451. Epub 2022 Sep 2.
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 Au 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 . An estimated LT longer than 77 000 h with initial luminance of 100 cd m reveals good operational stability. This work suggests a way for design of stable luminescent gold(I) complexes.
发光单核金（I）配合物作为光电子材料的实际应用受到其稳定性较差的限制。在此，我们展示了一种提高具有热激活延迟荧光（TADF）的金（I）配合物稳定性的策略。一种高度刚性且呈凹槽状的σ供体芳基配体被用于形成双Au⋅⋅⋅H-C氢键。二级金属-配体相互作用已通过单晶结构、核磁共振光谱和理论模拟得到证实。该TADF金配合物表现出吸引人的发射特性（光致发光量子产率 = 76%；延迟荧光寿命 = 1.2 μs）以及显著提高的热稳定性和光稳定性。真空沉积有机发光二极管（OLED）显示出有前景的电致发光，最大外量子效率（EQE）超过23%，即使在10000 cd m 时效率滚降也可忽略不计。估计初始亮度为100 cd m 时LT超过77000 h，显示出良好的操作稳定性。这项工作为设计稳定的发光金（I）配合物提供了一种方法。
