Li Guijie, Lou Weiwei, Wang Dan, Deng Chao, Zhang Qisheng
State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering , Zhejiang University of Technology , Hangzhou 310014 , P. R. China.
MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Department of Polymer Science and Engineering , Zhejiang University , Hangzhou 310027 , P. R. China.
ACS Appl Mater Interfaces. 2019 Sep 4;11(35):32209-32217. doi: 10.1021/acsami.9b08107. Epub 2019 Aug 20.
A new series of tetracoordinated boron-enabled thermally activated delayed fluorescence (TADF) materials with a donor-acceptor BF-type framework were designed and conveniently synthesized. Difluoroboron plays a critical role and acts as a key to coordinate with the latent acceptor of the 2-(4-phenylpyridin-2-yl)phenol (PPyPOH) moiety to realize TADF. TADF materials are air-stable and have a high photoluminescence quantum yield of up to 99%. NOBF2-Cz- and NOBF2-DPCz-doped blue OLEDs demonstrated EQEs of 11.0% with CIE coordinates of (0.14, 0.16) and 15.8% with (0.14, 0.28) and high brightness of 6761 and 19383 cd/m could be achieved, respectively. Moreover, the blue OLED doped with NOBF2-DPCz and the green OLED doped with NOBF2-DMAC achieved operational lifetimes at 50% of initial luminance ( = 500 cd/m), LT, of 54 and 920 h, respectively. This work indicates that these tetracoordinated difluoroboron molecules can act as efficient and stable TADF materials for OLED applications.
设计并简便合成了一系列具有给体-受体BF型骨架的新型四配位硼基热激活延迟荧光（TADF）材料。二氟硼发挥着关键作用，作为与2-(4-苯基吡啶-2-基)苯酚（PPyPOH）部分的潜在受体配位以实现TADF的关键。TADF材料在空气中稳定，具有高达99%的高光致发光量子产率。NOBF2-Cz和NOBF2-DPCz掺杂的蓝色有机发光二极管（OLED）的外量子效率（EQE）分别为11.0%，色坐标为(0.14, 0.16)，以及15.8%，色坐标为(0.14, 0.28)，并且分别可实现6761和19383 cd/m²的高亮度。此外，掺杂NOBF2-DPCz的蓝色OLED和掺杂NOBF2-DMAC的绿色OLED在初始亮度的50%（= 500 cd/m²）下的工作寿命，LT，分别为54和920小时。这项工作表明，这些四配位二氟硼分子可作为用于OLED应用的高效且稳定的TADF材料。
