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

摘要

The Mn-doped ZnS nanoparticles with $T_{d}^{2}-Foverline 43~{rm m}$ cubic structure and an average crystalline size of about 16 nm were synthesized using the hydrothermal method at 220 $^{circ}{rm C}$ for 15 h from ${rm Zn}({rm CH}_{3}{rm COO})_{2}(0.1{rm M})$ , ${rm Mn}({rm CH}_{3}{rm COO})_{2}(0.01{rm M})$ , and ${rm Na}_{2}{rm S}_{2}{rm O}_{3}(0.1{rm M})$ as the precursors. The appearance of characteristic photoemission bands of ${rm Mn}^{2+}(3{rm d}^{5})$ 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 ${rm Mn}^{2+}(3{rm d}^{10})$ ions substituted for ${rm Zn}^{2+}(3{rm d}^{10})$ 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.