Photosensitization of colloidal snosemiconductor nanoparticles with xanthene dyes

The photochemical behavior of xanthene dyes (fluorescein,erythrosine,and eosin) with colloidal snonanoparticles was probed by uv-visible,steady state,and time resolved fluorescence measurements. the prepared snonanoparticles were characterized by using uv-visible and powder xrd measurements. the xanthene dyes were adsorbed on the surface of colloidal snonanoparticles through electrostatic interaction. apparent association constant (k app) was calculated from the relevant fluorescence data. the larger value of apparent association constant indicates a strong association between xanthene dyes and snonanoparticles. the fluorescence quenching is mainly attributed to electron transfer from the excited state xanthenes to the conduction band of colloidal sno the electron transfer mechanism was explained based on the rehm-weller equation as well as the energy level diagram. © 2013 n. nagarajan et al.