Π‐Stacked Donor–Acceptor Dendrimers for Highly Efficient White Electroluminescence. (17th June 2021)

• Record Type: Journal Article
• Authors: Wang, Xingdong; Hu, Jun; Lv, Jianhong; Yang, Qingqing; Tian, Hongkun; Shao, Shiyang; Wang, Lixiang; Jing, Xiabin; Wang, Fosong
• Is Part Of: Angewandte Chemie. Volume 133:Number 30(2021)
• Page Start: 16721
• Page End: 16729
• Publication Date: 2021-06-17
• Subjects: dendrimer -- thermally activated delayed fluorescence -- through-space charge transfer -- white electroluminescence -- π-stacked; Chemistry -- Periodicals; 540
• DOI: 10.1002/ange.202104145
• Languages: English
• ISSNs: 0044-8249

Abstract

Abstract: π‐Stacked dendrimers consisting of cofacially aligned donors and acceptors are developed by introducing three dendritic teracridan donors with orthogonal configuration and three triazine acceptors in periphery of hexaphenylbenzene skeleton. The dendritic structure and orthogonal configuration of teracridan not only make their outer acridan segments approaching to acceptor in close distance, but also fix donor and acceptor in face‐to‐face alignment, leading to through‐space charge transfer emission with thermally activated delayed fluorescence (TADF) effect. By regulating charge transfer strength via substituent effect of acceptor, emission color of the dendrimers can be tuned from blue to yellow/red region. Solution‐processed two‐color white organic light‐emitting diodes (OLEDs) based on blue and yellow π‐stacked donor–acceptor dendrimers exhibit the maximum external quantum efficiency of 20.6 % and maximum power efficiency of 58.9 lm W −1, representing the state‐of‐the‐art efficiency for all‐TADF white OLEDs by solution process. Abstract : π‐Stacked dendrimers consisting of cofacially aligned donors and acceptors are developed by introducing three dendritic teracridan donors with orthogonal configuration and three triazine acceptors in periphery of hexaphenylbenzene skeleton, exhibiting through‐space charge transfer emission and thermally activated delayed fluorescence effect for white electroluminescence with state‐of‐the‐art power efficiency of 58.9 lm W −1 by solution process.