声化学法制备ZnS:Mn纳米晶及其光学性能

Optical Properties of ZnS:Mn Nanocrystallites Prepared by Sonochemical Method

以无水氯化锌,四水氯化锰以及硫代乙酰胺为原料,采用声化学法成功制备了锰掺杂的ZnS(ZnS∶Mn)纳米晶。采用透射电子显微镜镜(TEM)、X射线能谱仪(EDS)、X射线粉末衍射(XRD)和光致发光谱(PL)对所制得的纳米进行了表征。结果表明:所制备ZnS∶Mn为立方闪锌矿结构,纳米粒子的形貌接近于球形。平均晶粒尺寸为10 nm左右。PL光谱分析表明:所制备试样有两个主要的发射峰,分别位于在480 nm和570 nm左右,后者与体材料ZnS∶Mn相比发生了明显蓝移,但仍表现为橙黄色发光。Mn2+掺杂浓度对ZnS∶Mn的光致发光性能有显著影响,原料中Zn∶Mn∶S(物质的量比)为3∶1∶4,Mn2+掺杂浓度为2.64 at%时,光致发光光谱发射峰强度达到最大值。

Manganese-doped zinc sulfide （ZnS： Mn） nanocrystallites were successfully synthesized by sonochemical process using zinc chloride, manganese （ii） chloride tetrahydrate and thiacetamide as raw materials. The as-prepared ZnS： Mn nanocrystallites were characterized by X-ray diffraction （XRD） , energy disperse spectra （EDS） , transmission electron microscopy（TEM） and photoluminescence spectra （PL）. The results show that the as-prepared ZnS： Mn nanocrystallites are in cubic phase, sphalerite structure with sphere morphologies and the size of crystallites is about 10 nm. It could be found from the PL spectra that there are two main emission peaks located at 480 nm and 570 nm, respectively, and the later one present blue shifting comparing with ZnS body materials. The photoluminescence property is influenced markedly by the content of Mn2＋ in the raw materials, and the highest fluorescence intensity can be obtained with the doping concentration of Mn2＋ being 2.64 at%.