Efficient red fluorescent OLEDs based on aggregation-induced emission combined with hybridized local and charge transfer state
Efficient red fluorescent OLEDs based on aggregation-induced emission combined with hybridized local and charge transfer state
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基于聚集诱导发射与杂化局域和电荷转移态相结合的高效红色荧光 OLED
DOI：
10.1016/j.dyepig.2020.108770
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发表时间：
2021
影响因子：
4.5
通讯作者：
Shanfeng Xue
中科院分区：
文献类型：
--
作者：
Yuan Yu;Miao Cang;Wei Cui;Lei Xu;Runze Wang;Mizhen Sun;Huayi Zhou;Wenjun Yang;Shanfeng Xue
Limited by the energy gap law and large conjugate structures, red organic light-emitting diodes (OLEDs) have long been criticized for their efficiency problems. The aggregation-induced emission (AIE) effect and the reverse intersystem crossing process can lead to high photoluminescent quantum yields (PLQYs) and high exciton utilization efficiency (EUE), two key objectives for obtaining efficient OLEDs. In this work, we chose benzothiadiazole as the acceptor (A) and triphenylamine and phenothiazine as the donors (Ds) to design and synthesize a D–A–D red fluorescent molecule, PBTPA. Results of systematic photophysical measurements indicated PBTPA to exhibit AIE trending, manifesting as aggregation-induced enhanced emission and the characteristics of hybridized local and charge transfer (HLCT) states. These features facilitated high solid-state luminescence efficiency and high exciton utilization to be achieved. A non-doped device fabricated using PBTPA displayed a red electroluminescence peak at 656 nm, corresponding to the Commission International de L'Eclairage coordinates of (0.65, 0.32), and an external quantum efficiency of 1.62%. By calculation, the EUE reached a value of 50%. According to the results of theoretical calculations, the effective hot exciton channel between the second triplet (T2) and the lowest singlet (S1) was responsible for the high EUE. This EUE value is relatively good for this type of red OLEDs. Evidence indicates that combining AIE and HLCT has excellent potential to aid the discovery of new-generation highly efficient red OLEDs.
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影响因子：
8.4
作者：
Huang M;Yu R;Xu K;Ye S;Kuang S;Zhu X;Wan Y
通讯作者：
Wan Y
影响因子：
29.4
作者：
Xue, Jie;Liang, Qingxin;Qiao, Juan
通讯作者：
Qiao, Juan
用于高灵敏度和选择性检测水样中苦味酸的 AIE 活性发光体：吡啶基作为有效识别基团
影响因子：
4.5
作者：
Ma, Yuqing;Zhang, Yuyang;Yang, Jiaxiang
通讯作者：
Yang, Jiaxiang
影响因子：
14
作者：
Ruoyao Zhang;Guangle Niu;Zhiyang Liu;Joe H. C. Chau;Huifang Su;Michelle M. S. Lee;Yuan Gu;R. K.
通讯作者：
Ruoyao Zhang;Guangle Niu;Zhiyang Liu;Joe H. C. Chau;Huifang Su;Michelle M. S. Lee;Yuan Gu;R. K.
影响因子：
8.6
作者：
J. Partee;E. Frankevich;B. Uhlhorn;J. Shinar;Y. Ding;T. Barton
通讯作者：
J. Partee;E. Frankevich;B. Uhlhorn;J. Shinar;Y. Ding;T. Barton