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

• Long-lasting low-temperature photoluminescence decay in nano-CdS/PVA is observed.
• Characteristic time about 1.7 s for photoluminescence decay is measured.
• Accumulation of photo-excited carriers in traps within the PVA is shown.
• Transfer of the excitation from PVA to CdS nanoparticles is shown.

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

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