Optical and Magnetic Properties of Mn-Doped ZnS Nanoparticles Synthesized by a Hydrothermal Method

The Mn-doped ZnS nanoparticles with T 2 d - F4̅3m cubic structure and an average crystalline size of about 16 nm were synthesized using the hydrothermal method at 220 °C for 15 h from Zn(CH 3 COO) 2 (0.1M), Mn(CH 3 COO) 2 (0.01M), and Na 2 S 2 O 3 (0.1 M) as the precursors. The appearance of characteristic photoemission bands of Mn 2+ (3d 5 ) ions at 390, 430, 467, and 493 nm in the photoluminescence excitation spectra while monitoring the yellow-orange band at 585 nm showed that the Mn 2+ (3d 10 ) ions substituted for Zn 2+ (3d 10 ) ions in ZnS matrix and caused the ferromagnetism of Mn-doped ZnS nanoparticles. The dependence of photoluminescence, photoluminescence excitation spectra, and magnetization curves on Mn content and the wavelength of excitation radiation were reported.