Modulating emission color in Mn-doped ZnS/ZnO microbelts via thermal evaporation process

Typically, the photoluminescence spectra of ZnS nanostructures exhibit a blue emission band and this material is commonly doped with Cu2+ ions to produce a green band and with Mn2+ ions to yield a yellow-orange band for LEDs applications. In this paper, we exclusively focus on Mn-doped ZnS/ZnO microbelts fabricated by a thermal evaporation method. The presence of the ZnO phase in the microbelts without active oxidation of the samples after synthesis influenced the optical properties of the microbelts. Photoluminescence of the prepared microbelts can be turned from a green to an orange band by changing the ratio between MnCl2 and ZnS powder. Especially, at a precursor ratio of 0.5:1, the neutral white light encompasses blue, green, and orange bands that appear simultaneously. When the content of MnCl2 equals that of ZnS powder, a high-value color purity (93.88