开发具有优异光致发光量子产率(PLQY)、高激子利用效率(EUE)和平衡载流子迁移率的非掺杂蓝色有机发光二极管(OLED)是一项紧迫的挑战。在此,报道了两种基于热激子的蓝色分子,即 PPIFB 和 PPIBF。采用平面刚性芴作为主要共轭π桥,PPIFB具有小扭转角,限制了分子的旋转和振动弛豫,这使得PPIFB在纯薄膜中实现了高达90%的PLQY。此外,芴参与长程π堆积,丰富了弱分子间力,苯甲酰芴作为受体的引入引入了氢键相互作用,这增加并有助于实现平衡的载流子迁移率,空穴和电子迁移率高达2×10 −6 和 7.71 × 10 −7 cm 2 V −1 s −1 分别。此外,苯甲酰芴的引入增加了n轨道的贡献,导致自旋轨道耦合(SOC)高达14.7 cm −1 ,这有利于实现高激子利用率。 PPIFB的非掺杂OLED在459 nm处表现出最大外量子效率(EQE max )为9.1%,这是非掺杂蓝色荧光OLED的最佳结果之一。
Stability of carbonium ions. Part 3. The transmission of substituent effects across the fluorene and biphenyl systems
作者:Roger Bolton、Rita E. M. Burley
DOI:10.1039/p29770000426
日期:——
The effects of substituents (X) upon the rates of solvolysis of α-(7-X-fluoren-2-yl)benzyl chlorides parallel those of substituents in the corresponding reaction of α-(4-X-fluoren-2-yl)benzyl chlorides, although the former is the more susceptible system. These results are consistent with regarding fluorene as a planar biphenyl structure. Both aromatic systems transmit substituenteffects less well