Mn掺杂ZnS纳米晶的制备及发光性能研究

Preparation and Photoluminescence Properties of Mn Doped ZnS Nanocrystalline

采用水热溶剂热法合成了ZnS∶Mn纳米晶,讨论了锌硫摩尔比、水/乙二胺体积比、Mn离子掺杂浓度、温度、填充度、时间几个因素对其晶型、粒径和发光性能的影响。通过扫描电镜(SEM)、X射线粉末衍射仪(XRD)和荧光分光光度计(PL)对合成的ZnS∶Mn纳米晶的结构和光学性能进行表征。结果表明:锌硫比、水/乙二胺体积比、温度对硫化锌的晶型以及粒径影响显著。在所研究范围内,Mn掺杂量对硫化锌的晶型、结晶度、粒径无影响,但对其能级结构影响显著,且随着Mn离子掺杂量的增加,发光强度先增加后减小。由正交实验得出最佳工艺条件为:锌硫摩尔比为2∶1,水/乙二胺体积比为2∶1,锰掺杂浓度为5%,温度为180℃,填充度为70%,时间为12 h。

Mn-doped ZnS nanocrystalline was synthesized by solvothermal method.Effects of zinc-sulfur molar ratio,water/ethylenediamine volume ratio,Mn ion doping concentration,temperature,filling degree and time on crystal form,particle size and luminescence properties were discussed.Structure and photoluminescence property were characterized by SEM,XRD and PL.The results showed that zinc-sulfur molar ratio,water/ethylenediamine volume ratio and the temperature had a significant effect on the crystal form and particle size of zinc sulfide.The molar ration of Mn has no effect on the crystal type,crystallinity,and size of ZnS powder.In spite of that,the energy level structure of ZnS powder is influenced.With increasing of molar ration of Mn,the intensity of photoluminescence enhance,and decline soon.The optimum conditions were as follows:zinc-sulfur molar ratio was 2∶1,water/ethylenediamine volume ratio was 2∶1,manganese doping concentration was 5%,temperature was 180℃,filling degree was 70%,and time was 12 h.