Li Lin, Zhang Chun, Xu Lei, Ye Changqing, Chen Shuoran, Wang Xiaomei, Song Yanlin
School of Materials Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, P. R. China.
Key Laboratory of Green Printing, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, P. R. China.
Angew Chem Int Ed Engl. 2021 Dec 13;60(51):26725-26733. doi: 10.1002/anie.202110830. Epub 2021 Nov 15.
Triplet-triplet annihilation (TTA) upconversion is a special non-linear photophysical process that converts low-energy photons into high-energy photons based on sensitizer/annihilator pairs. Here, we constructed a novel luminescence ratiometric nanothermometer based on TTA upconversion nanomicelles by encapsulating sensitizer/annihilator molecules into a temperature-sensitive amphiphilic triblock polymer and obtained good linear relationships between the luminescence ratio (integrated intensity ratio of upconverted luminescence peak to the downshifted phosphorescence peak) and the temperature. We also found chemical modification of annihilators would rule out the interference of the polymer concentration and stereochemical engineering of annihilators would readily regulate the thermal sensitivity.
三重态-三重态湮灭（TTA）上转换是一种特殊的非线性光物理过程，它基于敏化剂/湮灭剂对将低能光子转换为高能光子。在此，我们通过将敏化剂/湮灭剂分子封装到温度敏感的两亲性三嵌段聚合物中，构建了一种基于TTA上转换纳米胶束的新型发光比率纳米温度计，并获得了发光比率（上转换发光峰与下移磷光峰的积分强度比）与温度之间的良好线性关系。我们还发现，对湮灭剂进行化学修饰可以排除聚合物浓度的干扰，而对湮灭剂进行立体化学工程可以很容易地调节热灵敏度。
