Microstructure and Optical Properties of ZnS:Mn Nanocrystals

Abstract:

Abstract. By using Na2S•9H2O as source precursor and citric acid as stabilizer, ZnS:Mn nanocrystallines were synthesized by solvothermal method. They were annealed at 800 oC in the charcoal powder. The structure, morphology and optical properties were investigated by using X-ray diffraction spectra (XRD), scanning electron microscopy (SEM), and Spectrofluorophotometer respectively. The results showed that all unannealed ZnS:Mn nanocrystallines were about 3~5 nm of particle size and have cubic structure, and all annealed samples were about 30-70 nm of particle size and have mixed structure of the cubic phase and hexagonal phase. Moreover, Mn2+ took the place of Zn2+ in ZnS:Mn. With the increment of Mn2+ content, there occurred a strong emission peak at about 596nm which can be attributed to the Mn2 + leap from 4T1 to 6A1. In addition, the intensity of 596nm emission peak first increased and then decreased with the increment of Mn2+ content, reaching a maximum at about 15% of Mn2+ content. After annealing Mn2+ emission peak intensity is about 20 times that before annealing, and the luminescence peak also showed slightly blue shift.

• Periodical: Advanced Materials Research (Volumes 652-654)
• Pages: 192-196
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.652-654.192
• Online since: January 2013
• Authors: Jin Hua Ma, Chang Zheng Wang, Chang Yong Sun
• Keywords: Microstructure, Nanocrystalline, Photoluminescence (PL), ZnS:Mn

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