Asymmetric enaminone difluoroboron complexes (BFs) exhibit highly solid emission and appropriated electron-accepting properties, whereas the position of the substituents has a significant influence on their optical properties due to the structural asymmetry. In this work, we employed BF as acceptor and 9,9-dimethylacridine (DMAC) as donor to construct two thermally activated delay fluorescence (TADF) molecules DMAC-BF and BF-DMAC, in which DMAC unit was set on the B-O and B-N sides of BF, respectively. DMAC-BF and BF-DMAC exhibited the broad orange-red emission bands in toluene, while they emitted yellow and red fluorescence in solid state, respectively. The photoluminescence quantum yield (PLQY) of DMAC-BF (52%) is higher than that of BF-DMAC (29%), owing to its lower nonradiative decay rate. Solution-processed organic light-emitting diode (OLED) devices based on both of DMAC-BF and BF-DMAC exhibited orange-red electroluminicence spectra. Owing to its higher photoluminescence quantum yield, DMAC-BF-based OLED exhibited better electroluminicence performance with a maximum current efficiency of 24.9 cd/A, a maximum power efficiency of 23.0 lm/W, and a maximum EQE of 11.3%.

不对称烯胺二氟硼配合物（BFs）表现出高固体发射和适当的电子接受性能，而由于结构的不对称性，取代基的位置对其光学性能有重大影响。在这项工作中，我们以BF为受体，以9,9-二甲基ac啶（DMAC）为供体，构建两个热激活延迟荧光（TADF）分子DMAC-BF和BF-DMAC，其中在BO和BN上均设置了DMAC单元高炉的两侧。DMAC-BF和BF-DMAC在甲苯中显示出较宽的橙红色发射带，而它们分别以固态发射黄色和红色荧光。DMAC-BF的光致发光量子产率（PLQY）（52％）比BF-DMAC的光致发光量子产率（29％）高，这是因为其非辐射衰减率较低。基于DMAC-BF和BF-DMAC的溶液处理有机发光二极管（OLED）器件显示出橙红色电致发光光谱。由于其较高的光致发光量子产率，基于DMAC-BF的OLED表现出更好的电致发光性能，最大电流效率为24.9 cd / A，最大功率效率为23.0 lm / W，最大EQE为11.3％。