TY - JOUR
T1 - Laser flash photolysis study on photophysical and photochemical properties of C60 fine particles
AU - Fujitsuka, Mamoru
AU - Kasai, Hitoshi
AU - Masuhara, Akito
AU - Okada, Shuji
AU - Oikawa, Hidetoshi
AU - Nakanishi, Hachiro
AU - Ito, Osamu
AU - Yase, Kiyoshi
N1 - Funding Information:
The present work is partly supported by the Grant-in Aid on Scientific Research on Priority Area (B) on ‘Laser Chemistry of Single Nanometer Organic Particle’ (No. 10207202) from the Ministry of Education, Science, Sports, and Culture, Japan.
PY - 2000/5/8
Y1 - 2000/5/8
N2 - Photophysical and photochemical properties of the C60 fine particles (C60FP) which were prepared by the reprecipitation method were examined by the time-resolved fluorescence and laser flash photolysis methods. Fluorescence decay of the fine particles can be divided into two components: emission from free exciton and self-trapped exciton. Rapid decay of the broad absorption after nanosecond-laser excitation was attributed to triplet-triplet annihilation due to migration of energy of triplet state within the fine particle. After the annihilation, the energy of triplet state localized on C60 molecule. Energy transfer from the localized C60 triplet state in the fine particle was confirmed for energy acceptors such as O2 and β-carotene. Photoexcitation of the C60FP in the presence of electron donor in solution resulted in photoinduced electron transfer. The reaction rate constant was one order smaller than that in solution, suggesting small collision frequency of the localized triplet state in C60FP. Oxidation of the fine particle was also observed by using methylacridinuim ion and biphenyl as a sensitizer and a cosensitizer, respectively.
AB - Photophysical and photochemical properties of the C60 fine particles (C60FP) which were prepared by the reprecipitation method were examined by the time-resolved fluorescence and laser flash photolysis methods. Fluorescence decay of the fine particles can be divided into two components: emission from free exciton and self-trapped exciton. Rapid decay of the broad absorption after nanosecond-laser excitation was attributed to triplet-triplet annihilation due to migration of energy of triplet state within the fine particle. After the annihilation, the energy of triplet state localized on C60 molecule. Energy transfer from the localized C60 triplet state in the fine particle was confirmed for energy acceptors such as O2 and β-carotene. Photoexcitation of the C60FP in the presence of electron donor in solution resulted in photoinduced electron transfer. The reaction rate constant was one order smaller than that in solution, suggesting small collision frequency of the localized triplet state in C60FP. Oxidation of the fine particle was also observed by using methylacridinuim ion and biphenyl as a sensitizer and a cosensitizer, respectively.
KW - Fine particle
KW - Fullerene
KW - Photoinduced electron transfer
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U2 - 10.1016/S1010-6030(00)00219-7
DO - 10.1016/S1010-6030(00)00219-7
M3 - Article
AN - SCOPUS:0346673812
SN - 1010-6030
VL - 133
SP - 45
EP - 50
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
IS - 1-2
ER -