Influence of pore size on the intensity of the monomer and excimer-like fluorescence of pyrene adsorbed onto porous glasses
Review articleOpen access
Abstract:

AbstractThe influence of the pore size of calcinated (773 K) porous glasses (average pore diameters, 40, 80 and 300 Å) on the ratio R of the emission intensity of the excimer-like fluorescence to that of the monomer fluorescence of pyrene adsorbed on porous glass was examined. R decreased with increasing pore size. The results were interpreted on the basis of the photophysical processes of adsorbed pyrene molecules on the surfaces. The ratio of the quantum efficiency for excimer formation from excited dimeric pyrene was estimated to be 1:0.23:0.11 for PG40, PG80 and PG300. The fractal nature of the surfaces of the individual porous glasses played an important role in the photophysical processes of pyrene encapsulated in the pores.

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