Panchromatic Light-Absorbing [70]Fullerene-Perylene-BODIPY Triad with Cascade of Energy Transfer as an Efficient Singlet Oxygen Sensitizer
Lifeng Dou,
Yuanming Li,
Lei Dong,
Shuao Zhang,
Yuanqi Wu,
Yu Gong,
Wei Yang,
Hongdian Lu,
Sane Zhu,
Xiaoguo Zhou
Affiliations
Lifeng Dou
School of Energy, Materials and Chemical Engineering, Hefei University, Hefei 230601, China
Yuanming Li
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
Lei Dong
School of Energy, Materials and Chemical Engineering, Hefei University, Hefei 230601, China
Shuao Zhang
School of Energy, Materials and Chemical Engineering, Hefei University, Hefei 230601, China
Yuanqi Wu
School of Energy, Materials and Chemical Engineering, Hefei University, Hefei 230601, China
Yu Gong
School of Energy, Materials and Chemical Engineering, Hefei University, Hefei 230601, China
Wei Yang
School of Energy, Materials and Chemical Engineering, Hefei University, Hefei 230601, China
Hongdian Lu
School of Energy, Materials and Chemical Engineering, Hefei University, Hefei 230601, China
Sane Zhu
School of Energy, Materials and Chemical Engineering, Hefei University, Hefei 230601, China
Xiaoguo Zhou
Hefei National Laboratory for Physical Sciences at the Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China
A panchromatic light-absorbing [70]fullerene-perylene-BODIPY triad (C70-P-B) was synthesized and applied as a heavy atom-free organic triplet photosensitizer for photooxidation. The photophysical processes were comprehensively investigated by the methods of steady-state spectroscopy, time-resolved spectroscopy, as well as theoretical calculations. C70-P-B shows a strong absorption ability from 300–620 nm. Efficient cascading intramolecular singlet-singlet energy transfer in C70-P-B was confirmed by the luminescence study. The backward triplet excited state energy transfer from C70 moiety to perylene then occurs to populate 3perylene*. Thus, the triplet excited states of C70-P-B are distributed on both C70 and perylene moiety with lifetimes of 23 ± 1 μs and 175 ± 17 μs, respectively. C70-P-B exhibits excellent photooxidation capacity, and its yield of singlet oxygen reaches 0.82. The photooxidation rate constant of C70-P-B is 3.70 times that of C70-Boc and 1.58 times that of MB, respectively. The results in this paper are useful for designing efficient heavy atom-free organic triplet photosensitizers for practical application in photovoltaics, photodynamic therapy, etc.
