Synthesis Of Anion-Doped ZnS Nanoparticles And Their Luminescence Properties

It is well known that Zinc sulfide (ZnS) is one of the most typical and important host materials, and doping elements can effectively enhance the luminescence properties of ZnS nanoparticles. The investigation on the luminescent properties of impurity doping and surface passivation on ZnS nanoparticles is significative for both scientific research and practical applications. So, the preparation and luminescence properties of ZnS::O and ZnS:Br nanoparticles were studied, and in this paper we have finished the work as follows:(1) O2--doped ZnS (ZnS:O) nanoparticles coated with surfactants agent PVA, CTAB, or SDS were successfully synthesized using a facile low temperature solid-state reaction method. The results showed that:these nanoparticles had a cubic zincblende crystal structure, and the average crystallite size of ZnS1-XOx nanoparticles can be easily customized by controlling surfactants and their concentration. Compared with the un-coated samples, ZnS1-XOx nanoparticles were more dispersible. It was found that these nanoparticles had strong blue emission, and coating with surfactants agent can remarkably increased their luminescence intensity. Dependence of the photoluminescence properties of the ZnS:O nanoparticles on the surfactants concentration was studied, and an optimal adding condition was found to be PVA:ZnS1-XOx=0.5:1(mass ratio), CTAB:ZnS1-XOx=0.3:1(mol ratio), or SDS:ZnS1-XOx=0.13:1(mol ratio). The emission intensity was2times,7times or5.8times higher than the un-coated samples in order.(2) Br--doped ZnS nanoparticles with different Br doping concentrations were successfully synthesized using the low temperature solid-state reaction method. The results showed that:these nanoparticles had a cubic zincblende crystal structure, and their average crystallite size was about8.0-9.5nm. The luminescence intensity of the Br-doped ZnS nanoparticles remarkably increased with Br doping concentration. The5mol%Br-doped ZnS nanoparticles was found to have an emission intensity about13times stronger than the un-doped ZnS nanoparticles. Besides, the influence of CTAB adding concentration on the crystallite sizes and luminescence properties of ZnS1-xBrx nanoparticles was investigated. These nanoparticles had an average crystallite size about7.4-8.1nm. The luminescence intensity of the Br-doped ZnS nanoparticles changed with CTAB adding concentration, and an emission intensity about2.2times stronger than the un-doped ZnS nanoparticles was found when CTAB:ZnS1-xBrx=0.4:1(mol ratio).