系统间交叉
材料科学
共发射极
荧光
共振(粒子物理)
摄动(天文学)
共振荧光
分子物理学
光电子学
核磁共振
光化学
原子物理学
光学
物理
激发态
量子力学
单重态
化学
作者
Xin Xiong,Jiaqi Li,T. Chen,Xiucai Fan,Ying‐Chun Cheng,Hui Wang,Feng Huang,Hao Wu,Jia Yu,Xiankai Chen,Kai Wang,Shun Zhang
标识
DOI:10.1002/adfm.202313726
摘要
Abstract For multiple resonance (MR) type thermally activated delayed fluorescence (TADF) emitters, electron cloud distributions of their π‐conjugated planes are crucial for determining their eventual performance. Currently, modulation attempts of MR‐TADF emitters are mainly inside the π‐conjugated planes. Possible out‐of‐plane interactions may also significantly impact the photophysical properties, but the exploration is quite limited. Here, a novel concept of using out‐of‐plane (e.g., π–π and lone pair‐π) interactions to introduce spatial perturbation (SPPT) to improve TADF performance is proposed. Two newly developed MR‐TADF emitters, namely, o‐BNPO and BNPO , which both consist of a popular MR framework, DtBuCzB , and diphenylphosphine oxide ( DPPO ), are compared in depth. In particular, for o‐BNPO , evident π–π interaction is observed between one side of the DtBuCzB π‐conjugated plane and a phenyl ring from DPPO , and lone pair‐π interaction with the oxygen atom from DPPO is noticed on the other side, resulting in significantly accelerated reverse intersystem crossing and better TADF without sacrificing narrowband emission features. Ultimately, in organic light‐emitting diodes with sensitizer‐free emitting layers, both emitters achieve similar narrowband emissions, while the o‐BNPO ‐based device demonstrates a much higher external quantum efficiency of 36% and milder efficiency roll‐off.
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