Preparation and Characterization of Heat Treated Zn Doped CdS Powders and It's Up and Down Conversion Luminescence
CdS powder samples with different amounts of ZnS (0, 20, 50, 80 and 100%) have been prepared by simple colloidal method at room temperature. Interesting results were observed when the samples were heat treated at high temperatures. The nano-powders were heat treated at 650 °C for 1.5 hours in air environment. These heat treated powder samples were characterized by different spectroscopic techniques to understand the structural, vibrational and electronic properties. From XRD results we observed that the heat treated CdS powder samples form CdS and CdSO4multi phases, ZnS powder samples form ZnO phase and doped powder samples form CdS, ZnO and CdSO4multiphase. Traces of SO–2 4ion absorption bands were identified from FTIR and Raman vibrational spectroscopy. Structural, vibrational and elemental analysis shows that oxygen is present in all the heat treated samples. From the diffused reflectance spectral (DRS) studies, two types of band edges (at ∼450 and ∼540 nm) were observed in case of the doped system. Observed upconversion luminescence from pure and doped samples belongs to the band edge emission from CdS phase. The slope of the plot of emission versus excitation intensities on a log–log scale is ∼2, indicating that the observed upconversion luminescence is due to two-photon excitation process.
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Document Type: Research Article
Publication date: September 1, 2013
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