TAILIEUCHUNG - Influence of mn2 concentration and uv irradiation time on the luminescence properties of mn doped zns nanocrystals

Influence of mn2 concentration and uv irradiation time on the luminescence properties of mn doped zns nanocrystals. The structure and particle size of the obtained powders were measured by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and shown that all samples are single phase with sphalerite crystal structure and average particle size of about 5-7nm. | Communications in Physics, Vol. 19, No. 1 (2009), pp. 33-38 INFLUENCE OF Mn2+ CONCENTRATION AND UV IRRADIATION TIME ON THE LUMINESCENCE PROPERTIES OF Mn-DOPED ZnS NANOCRYSTALS TRAN MINH THI Faculty of Physics, Hanoi National University of Education Abstract. ZnS:Mn were prepared by wet chemical method with Mn doping concentration from 0 at% to 12 at%. The structure and particle size of the obtained powders were measured by X-ray diffraction (XRD) and scanning electron microscopy (SEM) and shown that all samples are single phase with sphalerite crystal structure and average particle size of about 5 - 7 nm. The dependence of Mn2+ ions doped concentration, and UV irradiation time on the luminescent intensity of ZnS:Mn nanocrystals was discussed. I. INTRODUCTION Zinc sulphide (ZnS) is an important II-VI semiconducting material with a wide direct band gap of eV in the bulk [1]. It has potential application in optoelectronic devices such as blue emitting diodes [2], electroluminescent devices and photovoltaic cells [3]. The optical properties of impurities, such as transition metal ion, doped ZnS have been the focus of several studies; in particular, of Mn2+ ions doped in ZnS nanocrystals. ZnS:Mn nanocrystals exhibit an orange luminescence with a high quantum efficiency under the interband excitation of the host crystals by utraviolet (UV) light. The 4 T1 → 6 A1 transition within the 3d5 configuration of the divalent manganese ion (Mn+2 ) has been studied extensively and its orange-yellow luminescence in ZnS is well documented. This luminescence was also observed in nanocrystalline ZnS:Mn2+ and applications have already been suggested [4-7]. It has been found that the amount of Mn2+ ions affected its luminescence intensity. Also, the PL intensity of ZnS:Mn nanocrystals was founded to increase under UV irradiation [8]. In this paper, we report on the effect of Mn-doped concentration and the dependence of UV irradiation time on the PL intensity of the ZnS:Mn .

• Điện - Điện tử
• Uv irradiation time
• Scanning electron microscopy
• Particle size
• The luminescence properties
• The obtained powders
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