Fine-tuning the photophysical properties of thermally activated delayed fluorescent emitters using torsion angles: high performance sky-blue OLEDs
作者:Lisi Zhan、Yepeng Xiang、Zhanxiang Chen、Kailong Wu、Shaolong Gong、Guohua Xie、Chuluo Yang
DOI:10.1039/c9tc04804a
日期:——
(TADF) and aggregation-induced emission (AIE) characteristics on account of the highly twisted D–A structure. Their photophysical and electroluminescent properties can be well regulated through this isomeric strategy. Owing to its proper torsion angles and high photoluminescence quantum yields (PLQYs), the 3,4′ACSO2 based device achieves a maximum external quantum efficiency of 20.5% with sky blue emission
异构策略由于其对物理性质的深远影响而在分子设计中具有重要意义。这里,三种同分异构分子,2,3'ACSO 2,2,4'ACSO 2,和3,4'ACSO 2通过不对称连接方法将两个电子给体(D)的idine啶单元连接至电子受体(A)的二苯砜单元而设计。由于高度扭曲的D–A结构,这三种化合物均具有独特的热激活延迟荧光(TADF)和聚集诱导发射(AIE)特性。通过这种异构策略可以很好地调节它们的光物理和电致发光性质。3,4'ACSO 2由于具有适当的扭转角和高的光致发光量子产率(PLQYs),基于天蓝色发射的器件可实现20.5%的最大外部量子效率。这些结果表明,扭转角的异构策略微调是一种优化光物理和电致发光性质的实用方法。