Singlet excited state (S1) of higher fullerenes C76 and C84: correlation between lifetime and HOMO–LUMO energy gap
✍ Scribed by Hyun Sun Cho; Tae Kyu Ahn; Sung Ik Yang; Seung Min Jin; Dongho Kim; Seong Keun Kim; Hong Doo Kim
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 232 KB
- Volume
- 375
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Photophysical properties of higher fullerenes C 76 and C 84 were investigated in toluene by steady-state and transient absorption spectroscopy. Lifetimes of 75 and 35 ps were measured for the lowest excited state of C 76 and C 84 , respectively, which are much shorter than the values estimated from previous triplet-triplet absorption studies. It was found that the internal conversion rate constants, k IC , increased as the size of fullerene increased, and that k IC was strongly correlated with the HOMO-LUMO energy gap, DE g . From this correlation, an empirical relationship was obtained: log k IC (s À1 ) ¼ 14.59 ) 3.39 DE g (eV).