Photoluminescence characteristics of synthesized copper doped Cd1−x Zn x S quantum dots
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Free standing powders of copper-doped Cd1−x Zn x S (0 ≤ x ≤ 0.5) quantum dots (QDs) were synthesized using a simple chemical co-precipitation method. The copper concentration was varied from 0.01 to 10 at. wt% of Cd2+. X-ray diffraction and transmission electron microscope were used for crystallographic and morphological analyzes. Room temperature time resolved luminescence spectra were recorded using high peak power, pulsed N2-laser excitation. Decay time values for bluish green and yellow emission have been calculated from recorded luminescence decay curves. Decay time dependence on Cu2+ and Zn2+ concentrations have been studied in detail. These QDs will have wide applications as nanophosphors, solar cells, photocatalysts and chemical sensors.
KeywordsLower Unoccupied Molecular Orbital Excited State Lifetime Luminescence Decay Curve Decay Time Dependence Deep Trap Electron
Authors are grateful to RSIC, Punjab University, Chandigarh and especially Mr. Jagtar Singh for crystallographic and morphological studies.
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