π‐Stacked Donor–Acceptor Dendrimers for Highly Efficient White Electroluminescence

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 ter...

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Bibliographic Details
Published in:Angewandte Chemie International Edition 2021-07, Vol.60 (30), p.16585-16593
Main Authors: Wang, Xingdong, Hu, Jun, Lv, Jianhong, Yang, Qingqing, Tian, Hongkun, Shao, Shiyang, Wang, Lixiang, Jing, Xiabin, Wang, Fosong
Format: Article
Language:English
Subjects:
Charge transfer
Color
Configurations
dendrimer
Dendrimers
Dendritic structure
Efficiency
Electroluminescence
Emission
Emissions
Fluorescence
Maximum power
Organic light emitting diodes
Power efficiency
Quantum efficiency
Space charge
thermally activated delayed fluorescence
through-space charge transfer
Triazine
white electroluminescence
π-stacked
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Summary: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. 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.
ISSN:1433-7851
1521-3773
DOI:10.1002/anie.202104145