Enhanced Upconversion of Triplet Excitons for Conjugated Polymeric Thermally Activated Delayed Fluorescence Emitters by Employing an Intramolecular Sensitization Strategy

系统间交叉 材料科学 分子内力 光化学 量子产额 光致发光 荧光 分子间力 有机发光二极管 光子上转换 激子 单重态 发光 光电子学 激发态 量子效率 纳米技术 化学 光学 有机化学 分子 原子物理学 物理 量子力学 图层(电子)
作者
Yuchao Liu,Xingwen Tong,Xinrui Chen,Yafei Wang,Shian Ying,Zhongjie Ren,Shouke Yan
出处
期刊:ACS Applied Materials & Interfaces [American Chemical Society]
卷期号:13 (7): 8997-9005 被引量:16
标识
DOI:10.1021/acsami.0c22494
摘要

Endowed by a thermally activated delayed fluorescence (TADF) sensitizer with a high constant rate of reverse intersystem crossing, the singlet excitons could be accumulated and then delivered to emitting states through favorable Förster resonance energy transfer, bypassing the inefficient intersystem transition processes of emitters. However, the conventional intermolecular sensitization strategies suffer from inherent aggregation-induced quenching and inevitable phase segregation of TADF sensitizers and emitters. In this context, we proposed a novel intramolecular sensitization strategy by covalently incorporating the TADF sensitizer into conjugated polymeric emitters. After rationally regulating the proportions of sensitizer and emitter units in polymers, the intramolecular sensitized conjugated TADF polymers with anticipated photophysical properties and stable device performance were obtained. A superior kRISC value over 106 s–1 accompanied by a suppressed nonradiative transition of the triplet exciton could be gained; therefore, the photoluminescence quantum yield (PLQY) could reach nearly 90%. In accord with the superior PLQY values enhanced by our intramolecular sensitization strategy, the solution-processed organic light-emitting diodes (OLEDs) can achieve a maximum external quantum efficiency (EQE) value of 17.8% while still maintaining 16.0% at 1000 cd/m2 with extremely low efficiency roll-off. These results convincingly manifest the significance of an intramolecular sensitization strategy for designing high-efficiency polymeric TADF emitters.
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