ZnS:Mn纳米晶复合玻璃的制备与光学性能

Preparation and Luminescent Properties of ZnS:Mn Nanocrystals Embedded Glass

ZnS:Mn纳米晶复合玻璃因在橙红光波段优异的发光性能、高稳定性、无毒性等而受到研究者们的广泛关注。然而传统的熔融淬冷法制备温度高、退火时间长,容易造成所复合纳米晶组分的挥发、失效和团聚等问题,极大地降低了纳米晶复合玻璃的荧光性能。利用放电等离子体烧结(SPS)技术在980℃的较低温度下10min内制备得到ZnS:Mn纳米晶复合玻璃,并进行X射线衍射(XRD)、X射线光子能谱(XPS)、电子顺磁共振谱(ESR)、荧光光谱(PL)及荧光寿命进行表征。结果表明:低温快速烧结制度在避免Mn^(2+)氧化的同时还能驱动Mn^(2+)进入ZnS晶格,实现纳米晶的有效掺杂;通过对ZnS纳米晶组分的有效调控,抑制缺陷态荧光的产生,能进一步提高Mn^(2+)跃迁发光。利用SPS技术制备的高性能离子掺杂型纳米晶复合玻璃有望作为固体光转换材料应用于大功率LED器件。

ZnS:Mn nanocrystals embedded glass has attracted much attention due to the excellent luminescence performance in reddish orange range,high stability and non-toxicity.However,high temperature and long annealing time needed in a conventional melt-quenching method readily cause the volatilization,invalidation and agglomeration of nanocrystals,greatly reducing the luminescence performance.In this paper,ZnS:Mn nanocrystals embedded glass was prepared via spark plasma sintering(SPS)at 980℃for 10 min,and the samples were characterized by X-ray diffraction,X-ray photoelectron spectroscopy,electron spin resonance,photoluminescence and fluorescence lifetime analysis.The results show that rapidly sintering at a low temperature is beneficial to avoiding the oxidation of Mn^(2+)and driving Mn^(2+)into the ZnS lattice to realize the effective doping.Also,the generation of defect-related luminescence is suppressed by regulating the composition of ZnS nanocrystals,thereby further enhancing the Mn^(2+)transition luminescence.The ion-doped nanocrystals embedded glass prepared by SPS with the superior performance can be used as a promising solid light convertor in high-power LED devices.