Phosphorescence of CdS nanoparticles in polymer matrix as an indication of host-guest interaction

摘要

We report on the observation of the long-lasting low-temperature photoluminescence decay in thehybrid system nano-CdS/polyvinyl alcohol with a characteristic time of about 1.7 s. The origin of thephosphorescence is ascribed to the accumulation of photo-excited excitons in the traps within thepolymeric matrix with subsequent transfer of the excitation to the embedded CdS nanoparticles.