Wei Yaxiong, Zhou Miaomiao, Zhou Qiaohui, Zhou Xiaoguo, Liu Shilin, Zhang Song, Zhang Bing
Hefei National Laboratory for Physical Sciences at the Microscale and Department of Chemical Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Phys Chem Chem Phys. 2017 Aug 23;19(33):22049-22060. doi: 10.1039/c7cp03840b.
Three new triplet photosensitizers consisting of a bodipy derivative and C moieties were synthesized for triplet-triplet annihilation upconversion of perylene. With the extension of the π-conjugated structure of the bodipy derivative, the three photosensitizers exhibited different absorption wavelengths, e.g. 517 nm for B-2, 532 nm for B-4, and 557 nm for B-6. The steady-state and transient absorption, steady-state fluorescence, and upconverted fluorescence emission were investigated to reveal step-by-step the dynamic processes of the above systems. The quantum yields of intramolecular energy transfer, intersystem crossing, and triplet-triplet energy transfer were measured. From the upconverted fluorescence emission spectra, the overall quantum yield of the triplet-triplet annihilation upconversion, Φ, was determined to be 5.80% for B-2, 7.95% for B-4, and 4.99% for B-6.
合成了三种由硼二吡咯衍生物和碳部分组成的新型三重态光敏剂，用于苝的三重态-三重态湮灭上转换。随着硼二吡咯衍生物π共轭结构的延长，这三种光敏剂表现出不同的吸收波长，例如B-2为517nm，B-4为532nm，B-6为557nm。研究了稳态和瞬态吸收、稳态荧光和上转换荧光发射，以逐步揭示上述体系的动态过程。测量了分子内能量转移、系间窜越和三重态-三重态能量转移的量子产率。从上转换荧光发射光谱中，三重态-三重态湮灭上转换的总量子产率Φ，对于B-2确定为5.80%，对于B-4为7.95%，对于B-6为4.99%。
