Fabrication and optical properties of ZnS:Mn~(2+) quantum dots/ SiO_2 nanocomposites

摘要

ZnS:Mn~(2+) quantum dots (QDs)/SiO_2 nanocomposites were successfully synthesized by stober method. The results showed that the Mn~(2+) ions were substitutionally incorporated into the ZnS host and the average size of the ZnS:Mn~(2+) (5 %) QDs was about 5.5 nm. The yellow-orange emission from the Mn~(2+) ~4T_1-~6A_1 transition was observed in the photoluminescence spectra, the peak intensity increased as the Mn~(2+) doped ratio increased, and showed a maximum when the concentration of the Mn~(2+) ions kept at 3 %. As the hydrolysis time of tetraethyl orthosilicate increased, the intensity of the yellow-orange emission reached the highest value when t = 4 h for the ZnS:Mn~(2+) (5 %) QDs/SiO_2 nanocomposites.