Photophysics of Dyes in Heterogeneous Systems

ENRIQUE SAN ROMÁN

V. Carlos Paz

Congreso; XIII Encuentro Latinoamericano de Fotoquímica y Fotobiología; 2017

Recent results on the photophysics of dyes adsorbed or included into inert and semiconducting microparticles and layer-by-layer self-assembled and spin-coated polymer thin films will be summarized. Emphasis will be given to the effect of the supporting environment and dye-to-dye interactions at dye loadings up to 1 M and to the trade-off between light absorption and energy dissipation by real or virtual traps on increasing dye concentration.Some of this work was performed on systems characterized by the presence of light scattering. Solids composed by microcrystalline cellulose microparticles ? an air-tight, light-scattering environment ? were the workbench on which methods to quantify absolute fluorescence and triplet quantum yields, fluorescence reabsorption and reemission, and energy transfer and trapping were developed and tested [1]. Whenever needed, these methods will be briefly described.