The addition of stimuli‐responsiveness to anti‐Stokes emission provides a unique platform for biosensing and chemosensing. Particularly, stimuli‐responsive photon upconversion based on triplet–triplet annihilation (TTA‐UC) is promising due to its occurrence at low excitation intensity with high efficiency. This Minireview summarizes the recent developments of TTA‐UC switching by external stimuli such as temperature, oxygen, chemicals, light, electric field, and mechanical force. For the systematic understanding of the underlying general mechanisms, the switching mechanisms are categorized into four types: 1) aggregation‐induced UC; 2) assembly‐induced air‐stable UC; 3) diffusion‐controlled UC; and 4) energy‐transfer‐controlled UC. The development of stimuli‐responsive smart TTA‐UC systems would enable sensing with unprecedented sensitivity and selectivity, and expand the scope of TTA‐UC photochemistry by combination with supramolecular chemistry, materials chemistry, mechanochemistry, and biochemistry.

中文翻译：

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刺激响应分子光子上转换。

反斯托克斯发射的刺激响应能力的增加为生物传感和化学传感提供了独特的平台。特别是，基于三重态-三重态an灭（TTA-UC）的刺激响应光子上转换是有希望的，因为它以低激发强度高效率地发生。这份Minireview总结了通过外部刺激（例如温度，氧气，化学物质，光，电场和机械力）进行的TTA-UC转换的最新进展。为了系统地了解基本的通用机制，将转换机制分为四类：1）聚合诱导的UC；2）装配引起的空气稳定的UC; 3）扩散控制的UC; 和4）能量转移控制的UC。