Fabrication and optical properties of ZnS:Mn2+ quantum dots/SiO2 nanocomposites

Abstract

ZnS:Mn 2? quantum dots (QDs)/SiO 2 nanocomposites were successfully synthesized by stöber 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? 4 T 1 -6 A 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.

Synthesis and characterization of ZnSe: Ag/SiO2 nanoparticles

“…For instance, the SiO2-coated zinc based nanoparticles (e.g. ZnSe/ZnS/SiO 2 [11], ZnS: Mn/SiO 2 [12], Mn/ZnS@SiO 2 -NH 2 [13] and ZnS/SiO 2 [14]) were prepared by the Stober method. Up to now, to the best of our knowledge, the synthesis of SiO 2 -coated Agdoped ZnS nanoparticles (i.e.…”