Zn_(1-x)Mn_xS纳米颗粒的制备及发光性质

Preparation and luminescence of Zn_(1-x)Mn_xS nanoparticles

水热法制备Mn离子掺杂的ZnS（ZnS∶Mn）纳米颗粒,研究不同比例掺杂Mn离子对Zn1-xMnxS纳米颗粒光致发光性质的影响.通过X射线衍射（XRD）和透射电子显微镜（TEM）对样品的物相和形貌进行分析表征,结果显示Zn1-xMnxS（x=0、0.01、0.03、0.05、0.07、0.10）为六方纤锌矿结构的球形纳米晶,晶粒大小均匀,粒径在15-20nm之间.室温下,用350nm波长的紫外光激发Zn1-xMnxS纳米粒子,可以得到浅施主能级与锰t2能级之间的跃迁产生的蓝色发光,发光强度随锰掺杂量的增大先增强后减弱,发射峰位随锰掺杂量的变化有一定移动.究其原因可能与硫空位有关,硫空位影响ZnS的浅施主能级,锌锰比对硫空位的数量和能级位置有一定影响.

Mn-doped ZnS （ZnS： Mn） nanoparticles were prepared by hydrothermal method. Different proportions of Mn ions were used on Znl-xMnxS snanoparticles for studying the effects of proportion on the photoluminescence properties. The composition, morphology and microstructure of samples were characterized by X-ray diffraction （XRD） and transmission electron microscopy （TEM）. The results showed that Znl-xMnxS （x = 0,0.01,0.03,0.05,0.07,0.10） nanoparticles are the spherical nanometercrystals with hexagonal wurtzite structure. When Znl-xMnx nanoparticles were excited by ultraviolet light with a wavelength of 350 nm, a blue glow which is produced by transition between shallow donor level and manganese t2 level can be found. The luminous intensity of samples first enhances and then weakens with the increase of manganese proportion, and the emission peaks have a mobile with the change of manganese-doped content. These phenomena may be associated with sulphur vacancy, which affects shallow donor level of ZnS. At the same time, the number and level position of sulphur vacancy were affected by proportion of zinc-manganese.