Highly efficient non-doped blue fluorescent OLEDs with low efficiency roll-off based on hybridized local and charge transfer excited state emitters.
Highly efficient non-doped blue fluorescent OLEDs with low efficiency roll-off based on hybridized local and charge transfer excited state emitters.
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基于混合局部和电荷转移激发态发射器的具有低效率滚降的高效非掺杂蓝色荧光 OLED
DOI：
10.1039/d0sc01341b
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发表时间：
2020-04-28
期刊：
影响因子：
8.4
通讯作者：
Yang W
中科院分区：
文献类型：
--
作者：
Lv X;Sun M;Xu L;Wang R;Zhou H;Pan Y;Zhang S;Sun Q;Xue S;Yang W
设计具有杂化局域和电荷转移（HLCT）激发态的给体-受体（D-A）分子是制备具有高激子利用效率和外量子效率的有机发光二极管（OLED）的非常有效的策略。本文设计并合成了一种新型扭曲D-π-A荧光分子（三苯胺-蒽-菲并咪唑; TPAAnPI）。通过电子物理实验和密度泛函理论（DFT）分析研究了TPAAnPI的激发态性质，发现其荧光是由HLCT激发态引起的。使用TPAAnPI作为发光层的优化的非掺杂蓝色OLED表现出新颖的蓝色发射，其电致发光（EL）峰在470 nm处，对应于国际照明委员会（CIE）坐标（0.15，0.22）。所制造的称为器件II的器件表现出18.09 cd A-1的最大电流效率、12.35 lm W-1的功率效率、1029 900 cd cm-2的发光和11.47%的外量子效率（EQE），对应于91%的高激子利用效率。其EQE在1000 cd m−2的发光下保持高达9.70%，低效率滚降为15%。这些结果是最好的HLCT蓝光发射材料中涉及的非掺杂的蓝色荧光OLED。器件II的性能突出了TPAAnPI分子的巨大工业应用潜力。设计并合成了一种新型的蓝光荧光HLCT发光体。实现了具有低效率滚降的高效非掺杂蓝色OLED。
Designing a donor–acceptor (D–A) molecule with a hybridized local and charge transfer (HLCT) excited state is a very effective strategy for producing an organic light-emitting diode (OLED) with a high exciton utilization efficiency and external quantum efficiency. Herein, a novel twisting D–π–A fluorescent molecule (triphenylamine–anthracene–phenanthroimidazole; TPAAnPI) is designed and synthesized. The excited state properties of the TPAAnPI investigated through photophysical experiments and density functional theory (DFT) analysis reveal that its fluorescence is due to the HLCT excited state. The optimized non-doped blue OLED using TPAAnPI as a light-emitting layer exhibits a novel blue emission with an electroluminescence (EL) peak at 470 nm, corresponding to the Commission International de L'Eclairage (CIE) coordinates of (0.15, 0.22). A fabricated device termed Device II exhibits a maximum current efficiency of 18.09 cd A−1, power efficiency of 12.35 lm W−1, luminescence of ≈29 900 cd cm−2, and external quantum efficiency (EQE) of 11.47%, corresponding to a high exciton utilization efficiency of 91%. Its EQE remains as high as 9.70% at a luminescence of 1000 cd m−2 with a low efficiency roll-off of 15%. These results are among the best for HLCT blue-emitting materials involved in non-doped blue fluorescent OLEDs. The performance of Device II highlights a great industrial application potential for the TPAAnPI molecule. A new pure fluorescent blue HLCT-emitter was designed and synthesized. Highly efficient non-doped blue OLEDs with low efficiency roll-off were achieved.
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影响因子：
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作者：
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影响因子：
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作者：
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DOI：
10.1038/lsa.2016.121
发表时间：
2016-07
期刊：
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影响因子：
--
作者：
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通讯作者：
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