Influence of Polyvinyl Pyrrolidone on Absorption and Radiation Transitions of Mn\(^{2 + }\) ions in Mn-doped ZnS Nanoparticles

Abstract

Abstract. ZnS:Mn nanoparticles were synthesized by co-precipitation method from the precursors solutions of 0.1M Zn(CH 3 COO) 2 , Na 2 S and Mn(CH 3 COO) 2 then were capped with polyvinyl pyrrolidone. The XRD patterns showed that the ZnS:Mn nanoparticles possessed the T 2 d − F43m cubic structure with the average crystallite size of several nanometers. At 300 K, the obtained photoluminescence spectra showed only a wide yellow-orange band centered at 603 nm, which should be attributed to the radiation transition of [ 4 T 1 ( 4 G)→ 6 A 1 ( 6 S)] of Mn 2+ (3d 5 ) cations in the ZnS matrix. The excitation spectra recorded at 300 K on the other hand featured a strong photoluminescence band around 344 nm, which were assigned to the near band-edge absorption transition of ZnS host lattice, in addition with three weaker bands relating to the absorption transitions of468 nm, and [ 6 A 1 ( 6 S) → 4 T 2 ( 4 G)]: 492 nm of Mn 2+ (3d 5 ) cations. It was shown that the capping affected only the intensities of emissions bands.