Fluorescence of the antharacenes following Tn → T1 excitation studied by a double excitation method |
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Authors: | Shunsuke Kobayashi Koichi Kikuchi Hiroshi Kokubun |
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Institution: | Department of Chemistry, Faculty of Science, Tohoku University, Aramaki, Aoba, Sendai 980, Japan |
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Abstract: | The fluorescence from the lowest excited singlet state following excitation of the lowest triplet state was observed for anthracene, 9-methylanthracene, and 9-phenylanthracene in ethanol by a newly devised double excitation method which is essentially the combination of flash and laser photolysis. The quantum yield of intersystem crossing from the excited triplet state, Tn(n ? 2), to the lowest excited singlet state was markedly increased by methyl- and phenyl-substitution at the meso-position. |
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