Thermally Activated Delayed Fluorescence via Triplet Fusion
Thermally Activated Delayed Fluorescence via Triplet Fusion
复制标题
通过三重态融合的热激活延迟荧光
DOI：
10.1021/acs.jpclett.9b02393
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发表时间：
2019
影响因子：
5.7
通讯作者：
Li Yi
中科院分区：
文献类型：
--
作者：
Li Li;Zeng Yi;Chen Jinping;Yu Tianjun;Hu Rui;Yang Guoqiang;Li Yi
操纵三重态对于有机半导体和光化学转化具有技术上的吸引力。敏化光子上转换通过三重态聚变将低能光子转换为高能光子，在光伏器件和光伏电池的增强方面具有巨大的潜力。传统的敏化上转换需要三线态-三线态能量转移，这限制了上转换给体-受体对的发展。我们证明了一个上转换系统，通过利用三重态能量不足的供体在三重态受体矩阵，其中有效的热激活的三重态-三重态能量转移克服了高达180 meV的能量势垒和超过5%的上转换量子产率在固态下实现635 nm照射在195 mW/cm 2。通过热激活三重态-三重态能量转移实现的有效固态上转换，突破了传统的组分能级匹配限制，为从低能级敏化剂中提取三重态能量开辟了新途径。
Manipulating triplet states is technically intriguing for organic semiconductors and photochemical conversion. Sensitized photon upconversion that converts low-energy photons into higher-energy ones via triplet fusion holds great potential in augmentation of photovoltaic devices and photocatalysis. Conventional requirement of exothermic triplet–triplet energy transfer in sensitized upconversion constrains the development of upconversion donor–acceptor pairs. We demonstrate an upconversion system by utilizing a triplet energy-deficient donor within a triplet acceptor matrix, in which efficient thermally activated triplet–triplet energy transfer overcoming an energy barrier of up to 180 meV and an over 5% upconversion quantum yield in the solid state are achieved upon 635 nm irradiation at 195 mW/cm2. The effective solid-state upconversion through thermally activated triplet–triplet energy transfer establishes a new pathway to extract triplet energy from low-lying sensitizers, transcending traditional restriction in matching components energy level.