Photon Upconversion with a Low Threshold Excitation Intensity in Plain Water
Photon Upconversion with a Low Threshold Excitation Intensity in Plain Water
复制标题
普通水中低阈值激发强度的光子上转换
DOI：
10.1021/acs.jpcb.2c04109
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发表时间：
2022
期刊：
影响因子：
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通讯作者：
Yui Tatsuto
中科院分区：
文献类型：
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作者：
Nakadai Yuki;Tsuchiya Shuta;Uehara Masumi;Umezawa Sena;Motoki Reina;Umezawa Hibiki;Ikoma Tadaaki;Yui Tatsuto
建立了一个基于三重态-三重态湮灭的低阈值激发强度光子上转换系统。水溶性阴离子卟啉（PdTPPS 4-）和二苯基蒽（DCDPA 2-）衍生物分别用作光吸收和发射分子，并且不需要表面活性剂等添加剂。PdTPPS 4-在528 nm激发波长下的磷光发射被DCDPA 2-猝灭，导致三重态能量转移，而DCDPA 2-在短波长区（400-500 nm）观察到荧光。三个独立的发射研究，利用不同的激发光源验证了TTA-UC过程中的一个简单的水溶液。根据在脉冲激光激发下检测到的磷光和荧光的时间曲线，TTA发生在三重态能量转移之后。TTA-UC的Ith估计低于6 mW cm-2，但由于实验装置的灵敏度限制，无法准确确定。DCDPA 2-和PdTPPS 4-水溶液的Ith上限是迄今为止在水溶液体系中获得的最小值，与有机溶液中的高性能TTA-UC体系相当。
A triplet–triplet annihilation-based photon upconversion (TTA-UC) system with a low threshold excitation intensity (Ith) in plain water was developed. Water-soluble anionic porphyrin (PdTPPS4–) and diphenylanthracene (DCDPA2–) derivatives were used as light absorbers and emitter molecules, respectively, and no additives such as surfactants were required. The phosphorescence emission from PdTPPS4–under an excitation wavelength of 528 nm was quenched by DCDPA2–, resulting in triplet energy transfer, whereas fluorescence from DCDPA2–was observed in a short wavelength region (400–500 nm). Three independent emission studies utilizing different excitation light sources validated the TTA-UC process in a simple aqueous solution. TTA occurred after the triplet energy transfer, according to the time profiles of phosphorescence and fluorescence detected following pulse laser excitation. TheIthfor TTA-UC was estimated to be lower than 6 mW cm–2, although it could not be exactly determined due to the sensitivity limit of the experimental setup. The upper limit ofIthfor the aqueous solution of DCDPA2–and PdTPPS4–is the smallest value obtained to date for aqueous systems and comparable to that of high-performance TTA-UC systems in organic solutions.