tailieunhanh - Preparation by wet chemical method and some of properties of ZnS and ZnS : Mn2 nano materials

Semiconductors nanoparticles have quantum size effects and non-linear optical characteristics as well as high quantum efficiency, making them next-generation materials that can be applied in various optoelectronic devices. Semiconductor nanoparticles have attracted much attention because of their novel electric and optical properties originating from surface and quantum confinement effects. | Journal of Science of Hanoi National University of Education Natural sciences Volume 52 Number 4 2007 pp. 72- 76 preparation by wet chemical method and some of properties of ZnS and ZnS Mn2 nano materials Tran Minh Thi Nguyen Minh Thuy Pham Kim Tuyen Faculty of Physics Hanoi University of Education 1 Introductions Zinc sulphide ZnS is important II-VI semiconducting material with a wide direct band gap of eV in the bulk 1 . It has potential applications in optoelectronic devices such as blue emitting diodes 2 electroluminescent devices and photovoltaic cells 3 . Semicon- ductors nanoparticles have quantum size effects and non-linear optical characteristics as well as high quantum efficiency making them next-generation materials that can be ap- plied in various optoelectronic devices. Semiconductor nanoparticles have attracted much attention because of their novel electric and optical properties originating from surface and quantum confinement effects. Manganese- doped materials represent a class of phosphors that have already found their way into applications. The transition within the 3d5 configuration of the divalent man- ganese ion M n 2 has been studied extensively and its orange- yellow luminescence in ZnS is well documented. This luminescence was also observed in nanocrystalline ZnS M n 2 4 and applications have already been suggested 5 . Different types of Mn2 centers are present in nanocrystalline ZnS M n2 6 . The orange luminescence originates from M n2 ions on Zn 2 sites where the M n2 are tetrahedral coordinated by S 2 . Many articles have reported on factors influencing the quantum efficiency of nanoparticles ZnS M n2 6 7 . The luminescence quantum efficiency is important for the potential use of nanocrystalline ZnS M n2 in light emitting devices where a high luminescence quantum efficiency is required. 2 Experimental ZnS and ZnS MnS nanoparticles are prepared by wet-chemical method. This method was used chemical substances Zn CH3COO 2 .2H2 O M n .

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