AbstractMost multi‐resonance (MR) induced thermally activated delayed fluorescence (TADF) emitters generally exhibit strong aggregation and relatively worse solubility due to their rigid and planar molecule structures, which is highly undesirable for solution‐processible devices. Herein, a simple but feasible approach for solution‐processible small‐molecule MR‐TADF emitters is developed by incorporating two MR‐TADF units onto carbazole bridge bearing long alkyl chains. The obtained emitters demonstrate supreme film‐forming capability and narrowband emissions with full‐width at half‐maximums (FWHMs) of 22 nm. The resulting solution‐processed narrowband electroluminescent devices achieve maximum external quantum efficiency of 27.1 %, which represents the highest efficiency among the solution‐processed OLEDs based on MR‐TADF emitters. This simple approach reveals great potential of developing solution‐processible emitters for rigid and planar molecular structures.
摘要大多数多共振(MR)诱导热激活延迟荧光(TADF)发射器由于其刚性和平面分子结构,通常表现出强烈的聚集性和相对较差的溶解性,这对于溶液可处理设备来说是非常不理想的。在本文中,通过在带有长烷基链的咔唑桥上加入两个 MR-TADF 单元,开发出了一种简单可行的溶液可处理小分子 MR-TADF 发射器。所获得的发射器具有极强的成膜能力和窄带发射能力,半最大值全宽(FWHM)为 22 nm。所得到的溶液加工窄带电致发光器件的最大外部量子效率为 27.1%,是基于 MR-TADF 发射体的溶液加工有机发光二极管中效率最高的。这种简单的方法揭示了为刚性和平面分子结构开发溶液加工型发光体的巨大潜力。