Total fluorescence spectra of free base chlorin and its photo-product in polyvinylbutyral at liquid helium temperatures
Huang, W. Y.; Rebane, A.; Wild, U. P.; Johnson, L. W. (1997). Total fluorescence spectra of free base chlorin and its photo-product in polyvinylbutyral at liquid helium temperatures. Journal of Luminescence, 71 (3), 237−243.
Huang, W. Y.; Rebane, A.; Wild, U. P.; Johnson, L. W.
Journal of Luminescence
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English, The total fluorescence spectra of free base chlorin and its photoproduct in polyvinylbutyral at liquid helium temperatures were investigated. Five electronic origins (pi pi*) Of chlorin were identified, For the photoproduct, the S-1 <-- S-0 (pi pi*) origin and three possible Soret bands were found. The energy selection phenomenon upon S-1 <-- S-0 excitation was observed for both tautomers. In the case of free base chlorin, energy selection for the S-3 <-- S-0 excitation was also observed. The broad spectral features corresponding to the S-1 <-- S-0 transition of the photoproduct suggest that there is strong interaction between its electronic transition and the matrix, and its large Stokes shift supports the contention that there is a substantial change in geometry in its first excited state.
chlorin; polyvinylbutyral; fluorescence; low temperature