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Hyperfluorescent polymers enabled by through-space charge transfer polystyrene sensitizers for high-efficiency and full-color electroluminescence
Chemical Science ( IF 7.6 ) Pub Date : 2021-09-03 , DOI: 10.1039/d1sc04389g Jun Hu 1, 2 , Yinuo Wang 1, 2 , Qiang Li 1, 2 , Shiyang Shao 1 , Lixiang Wang 1, 2 , Xiabin Jing 1 , Fosong Wang 1
Chemical Science ( IF 7.6 ) Pub Date : 2021-09-03 , DOI: 10.1039/d1sc04389g Jun Hu 1, 2 , Yinuo Wang 1, 2 , Qiang Li 1, 2 , Shiyang Shao 1 , Lixiang Wang 1, 2 , Xiabin Jing 1 , Fosong Wang 1
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Fluorescent polymers are suffering from low electroluminescence efficiency because triplet excitons formed by electrical excitation are wasted through nonradiative pathways. Here we demonstrate the design of hyperfluorescent polymers by employing through-space charge transfer (TSCT) polystyrenes as sensitizers for triplet exciton utilization and classic fluorescent chromophores as emitters for light emission. The TSCT polystyrene sensitizers not only have high reverse intersystem crossing rates for rapid conversion of triplet excitons into singlet ones, but also possess tunable emission bands to overlap the absorption spectra of fluorescent emitters with different bandgaps, allowing efficient energy transfer from the sensitizers to emitters. The resultant hyperfluorescent polymers exhibit full-color electroluminescence with peaks expanding from 466 to 640 nm, and maximum external quantum efficiencies of 10.3–19.2%, much higher than those of control fluorescent polymers (2.0–3.6%). These findings shed light on the potential of hyperfluorescent polymers in developing high-efficiency solution-processed organic light-emitting diodes and provide new insights to overcome the electroluminescence efficiency limitation for fluorescent polymers.
中文翻译：
通过空间电荷转移聚苯乙烯敏化剂实现高效率和全色电致发光的超荧光聚合物
荧光聚合物的电致发光效率低，因为由电激发形成的三线态激子通过非辐射途径被浪费。在这里，我们通过使用空间电荷转移 (TSCT) 聚苯乙烯作为三线态激子利用的敏化剂和经典的荧光发色团作为发光体来展示超荧光聚合物的设计。TSCT 聚苯乙烯敏化剂不仅具有高反向系统间交叉率，可将三重态激子快速转化为单重态激子，而且还具有可调发射带，以重叠具有不同带隙的荧光发射体的吸收光谱，从而实现从敏化剂到发射体的有效能量转移。由此产生的超荧光聚合物表现出全色电致发光，峰值从 466 扩展到 640 nm，最大外部量子效率为 10.3-19.2%，远高于对照荧光聚合物（2.0-3.6%）。这些发现揭示了超荧光聚合物在开发高效溶液加工有机发光二极管方面的潜力，并为克服荧光聚合物的电致发光效率限制提供了新的见解。
更新日期：2021-09-15
中文翻译：
通过空间电荷转移聚苯乙烯敏化剂实现高效率和全色电致发光的超荧光聚合物
荧光聚合物的电致发光效率低，因为由电激发形成的三线态激子通过非辐射途径被浪费。在这里，我们通过使用空间电荷转移 (TSCT) 聚苯乙烯作为三线态激子利用的敏化剂和经典的荧光发色团作为发光体来展示超荧光聚合物的设计。TSCT 聚苯乙烯敏化剂不仅具有高反向系统间交叉率，可将三重态激子快速转化为单重态激子，而且还具有可调发射带，以重叠具有不同带隙的荧光发射体的吸收光谱，从而实现从敏化剂到发射体的有效能量转移。由此产生的超荧光聚合物表现出全色电致发光，峰值从 466 扩展到 640 nm，最大外部量子效率为 10.3-19.2%，远高于对照荧光聚合物（2.0-3.6%）。这些发现揭示了超荧光聚合物在开发高效溶液加工有机发光二极管方面的潜力，并为克服荧光聚合物的电致发光效率限制提供了新的见解。
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