Donor or Acceptor: Molecular Engineering Based on dibenzo[a,c]phenazine Backbone for Highly Efficient Thermally‐Activated Delayed Fluorescence Organic Light‐Emitting Diodes
Donor or Acceptor: Molecular Engineering Based on dibenzo[a,c]phenazine Backbone for Highly Efficient Thermally‐Activated Delayed Fluorescence Organic Light‐Emitting Diodes
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捐赠者或接受者：基于二苯并[a，c]吩嗪主链的高效热激活延迟荧光有机电致发光器件的分子工程
DOI：
10.1002/adom.202201695
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发表时间：
2022-11
影响因子：
9
通讯作者：
Yanyan Liu;Jiaji Yang;Z. Mao;Dongyu Ma;Yuyuan Wang;Juan Zhao;Shi-jian Su;Zhenguo Chi
中科院分区：
文献类型：
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作者：
Yanyan Liu;Jiaji Yang;Z. Mao;Dongyu Ma;Yuyuan Wang;Juan Zhao;Shi-jian Su;Zhenguo Chi
Thermally‐activated delayed fluorescence (TADF) emitters are usually constructed with twisted donor‐acceptor (D‐A) frameworks, while studies on the relationship between diverse D‐A structures are still in high demand to achieve high‐performance emitters. Herein, by adopting triphenylamine as electron donor and dibenzo[a,c]phenazine as electron acceptor, three TADF molecules are reported with different frameworks of D‐A (TPZ), D‐A‐D (DPZ) and D‐A‐A (APZ). Theoretical and experimental results demonstrate that different D‐A frameworks play significant effects on photophysical, horizontal dipole ratio, and electroluminescence properties of the TADF molecules. In comparison, the APZ‐OLED device achieves the best performance with a maximum external quantum efficiency of 27.5%, resulting from its low energy gap between the singlet and triplet, effective reverse intersystem crossing, high photoluminescence quantum yield, and horizontal dipole ratio. This work provides an insight into the relationship between efficient TADF emitters and rational molecular design engineering.
