Abstract
Frequency and time domain interrogation of polyvinyl pyrrolidone (PVP) capped CdS nanoparticles synthesized by wet chemistry route have been performed. The optical absorption and temperature dependent photoluminescence (PL) properties have been studied. Time resolved PL studies have been performed at different wavelengths of the emission spectrum. The blue-shift of absorption band-edge confirms the quantum confinement effect due to the reduced size of the nanoparticles. Two PL peaks at 465 nm and 550 nm are observed. The temperature dependent PL study of CdS –PVP nanoparticles shows that the 550 nm peak originates from defect states and its intensity decreases exponentially with increasing temperature. Wavelength dependence of the PL lifetime suggests that the observed PL spectrum is the superposition of emissions originating from different excited states.
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