与掺杂浓度相关的ZnS∶Mn纳米粒子的发光性质

采用溶胶法制备了Mn掺杂的ZnS纳米粒子,探讨了掺杂离子浓度对ZnS∶Mn纳米粒子的晶体结构和发光性质的影响。通过X射线衍射（XRD）对样品的结构进行了表征,结果表明：所制备的ZnS∶Mn纳米粒子为立方闪锌矿结构,其在Mn离子的掺杂浓度达到6%时不发生分相,但随着掺杂浓度的增加,纳米粒子的平均粒径会减小。光致发光光谱和荧光光谱的结果表明：通过改变掺杂离子的浓度可实现对ZnS∶Mn纳米粒子590 nm附近荧光发射波长的调节。此外,研究了温度对纳米粒子形貌和发光性质的影响。高分辨透射电子显微镜（HRTEM）观察发现,经过50℃陈化1 h后的ZnS∶Mn样品的平均粒径增大约为20 nm,且加热陈化有利于ZnS∶Mn纳米粒子中Mn2＋在590 nm处产生荧光。

Luminescent properties of ZnS:Mn nanoparticles dependent on doping concentration

Mn-doped ZnS nanoparticles were prepared by the Sol-Gel process in this paper, and the influence of doping ion concentration on crystal structures and luminescent properties of ZnS: Mn nanoparticles was discussed. The structures of the samples were characterized by an X-ray diffractometer(XRD). The results show that the as-prepared ZnS: Mn nanoparticles belong to the cubic sphalerite structure. The parvafacies do not occur when Mn²⁺-doping concentration reaches 6% and the average particle sizes of nanoparticles decrease with the increase of doping concentration. Photoluminescence(PL) spectroscopy and fluorescence spectrum results show that the emission wavelengths of ZnS: Mn nanoparticles around 590 nm can be adjusted by changing the concentration of the ions. In addition, the influence of temperature on morphology and luminescent properties of nanoparticles was studied. The result observed from a high resolution transmission electron microscopy(HRTEM) shows that the average particle sizes of ZnS: Mn samples increase to about 20 nm after ageing for 1 h at the temperature of 50℃. The heating ageing is beneficial to Mn²⁺ fluorescence produced at 590 nm for ZnS:Mn nanoparticles.