Photoluminescence of Cu-doped and Cu-doped ZnS nanocrystallites |
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Authors: | Ping YangChunfeng Song Mengkai Lü Guangjun ZhouZhongxi Yang Dong XuDuorong Yuan |
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Institution: | a State Key Laboratory of Crystal Materials, Shandong University, Jinan, 250100, P. R. China b Shandong Supervision and Inspection Institute for Product Quality, Jinan, 250100, P. R. China c Shandong Institute of Building Materials, Jinan, 250022, P. R. China |
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Abstract: | ZnS:Cu+ and ZnS:Cu2+ nanocrystallites have been obtained by chemical precipitation from homogeneous solutions of zinc, copper salt compounds, with S2− as precipitating anion formed by decomposition of thioacetamide. X-ray diffraction (XRD) analysis shows that average diameter of particles is about 2.0-2.5 nm. The nanoparticles can be doped with copper during synthesis without altering XRD pattern. However, the emission spectrum of ZnS nanocrystallites doped with Cu+ and Cu2+ consists of two emission peaks. One is at 450 nm and the other is at 530 nm. The absorptive spectrum of the doped sample is different from that of un-doped ZnS nanoparticles. Because the emission process of the Cu+ luminescence center in ZnS nanocrystallites is remarkably different from that of the Cu2+ luminescence center, the emission spectra of Cu+-doped samples are different from those of Cu2+-doped samples. |
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