Ce^(3+)掺杂ZnS量子点的制备和发光性能

Synthesis and Photoluminescence Properties of Ce^(3+)-doped ZnS Quantum Dots

本文采用低温固相法合成了不同浓度铈离子(Ce^(3+))掺杂的硫化锌(ZnS)量子点,探讨了Ce^(3+)掺杂对ZnS量子点的晶体结构、粒径、形貌以及光致发光性能的影响。结果表明:ZnS:x%Ce^(3+)(x=0,3,6,9)量子点具有立方闪锌矿晶体结构,平均粒径在6.16-9.73 nm之间。紫外-可见漫反射光谱和光致发光光谱结果显示:Ce^(3+)掺杂会降低ZnS量子点的禁带宽度,增加载流子浓度,提高辐射复合几率,进而提高量子点的发光强度。

In this paper,zinc sulphide(ZnS) quantum dots doped with different concentrations of cerium ions(Ce^(3+))were synthesized by a low-temperature solid-phase method,and the effect of Ce^(3+) doping on the crystal structure,particle size,morphology and photoluminescence properties of ZnS quantum dots were investigated.The results showed that the ZnS:x%Ce^(3+)(x=0,3,6,9) quantum dots had cubic sphalerite crystal structures with average particle sizes ranging from 6.16-9.73 nm.The results of ultraviolet visible diffuse reflectance spectroscopy and photoluminescence spectroscopy showed that Ce^(3+) doping decreased the forbidden band width of the ZnS quantum dots,increased the carrier concentration,improved the chance of radiation complexation and thus increased the luminescence intensity of the quantum dots.