Yu Fei-Hu, Song Xiu-Fang, Liu Guan-Hao, Chang Xiaoyong, Li Kai, Wang Ying, Cui Ganglong, Chen Yong
Key Laboratory of Photochemical Conversion and Optoelectronic Materials & CAS-HKU Joint Laboratory on New Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, 100190, Beijing, P. R. China.
University of Chinese Academy of Sciences, 100049, Beijing, P. R. China.
Chemistry. 2022 Dec 1;28(67):e202202439. doi: 10.1002/chem.202202439. Epub 2022 Oct 5.
Two-coordinate donor-metal-acceptor type coinage metal complexes displaying efficient thermally activated delayed fluorescence (TADF) have been unveiled to be highly appealing candidates as emitters for organic light-emitting diodes (OLEDs). Herein a series of green to yellow TADF gold(I) complexes with alkynyl ligands has been developed for the first time. The complexes exhibit high photoluminescence quantum yields (PLQYs) of up to 0.76 in doped films (5 wt % in PMMA) at room temperature. The modifications of alkynyl ligands with electron-donating amino groups together with the use of electron-deficient carbene ligands induce ligand-to-ligand charge transfer excited states that give rise to TADF emission. Spectroscopic and density functional theory (DFT) calculations reveal the roles of electron-donating capability of the alkynyl ligand in tuning the excited-state properties. Solution-processed organic light-emitting diodes (OLEDs) using the present complexes as emitters achieve maximum external quantum efficiency (EQE) of up to 20 %.
具有高效热激活延迟荧光（TADF）的双配位供体-金属-受体型硬币金属配合物已被证明是作为有机发光二极管（OLED）发光体的极具吸引力的候选物。在此，首次开发了一系列具有炔基配体的绿色至黄色TADF金（I）配合物。这些配合物在室温下的掺杂薄膜（在PMMA中为5 wt％）中表现出高达0.76的高光致发光量子产率（PLQY）。用供电子氨基修饰炔基配体以及使用缺电子卡宾配体诱导了配体间电荷转移激发态，从而产生TADF发射。光谱和密度泛函理论（DFT）计算揭示了炔基配体的供电子能力在调节激发态性质中的作用。使用本配合物作为发光体的溶液处理有机发光二极管（OLED）实现了高达20％的最大外量子效率（EQE）。
