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Hypocrellin B (HB), a natural pigment, when adsorbed on colloidal TiO 2 can participate in the sensitization process by injecting electrons from its excited singlet and triplet states into the conduction band of the semiconductor. Upon excitation in its absorption band, 80% of the fluorescence emission of HB could be quenched by colloidal TiO 2 . Lifetime measurements and time-resolved...