Förster electronic excitation energy transfer upon adsorption of meso-tetra(3-pyridyl)porphyrin on InP@ZnS colloidal quantum dots

Adsorption of meso-tetra(3-pyridyl)porphyrin (TPyP) on InP@ZnS colloidal quantum dots (QDs) has been studied by fluorescence spectroscopy. It has been found that after addition of TPyP to a solution of InP@ZnS QDs, the processes of growth of the TPyP photoluminescence intensity and quenching of InP@ZnS QD photoluminescence occur. The kinetics of these processes in the time range from a few seconds to tens of hours is logarithmic, which indicates a dispersion of the activation energy of the dye adsorption. The increase in the photoluminescence intensity of TPyP upon the adsorption is due to Förster resonance energy transfer. The adsorption of TPyP leads to small changes in its spectral characteristics and luminescence lifetime.