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利用硫代乙醇酸作为稳定剂在水相中合成了Fe:ZnSe/ZnS核/壳结构半导体纳米晶,研究了表面修饰层(壳层)厚度对产物光学性能的影响。XRD和UV-Vis吸收谱表明,合成的半导体纳米晶为核壳纳米晶,呈立方闪锌矿结构。TEM结果表明,产物分散性较好,尺寸均一,呈球形。PL结果表明,适当厚度的ZnS壳层能有效钝化Fe:ZnSe纳米晶表面的非辐射复合位点,当壳层过厚时,ZnS壳层产生的非辐射复合缺陷会导致PL强度下降。
The effects of the thickness of the surface modification layer (shell) on the optical properties of the product were investigated by using thioglycolic acid as stabilizer in the aqueous nanocrystal of Fe: ZnSe / ZnS core / shell. XRD and UV-Vis absorption spectra show that the synthesized semiconductor nanocrystals are core-shell nanocrystals with a cubic sphalerite structure. TEM results show that the product is better dispersion, uniform size, spherical. PL results show that proper thickness of ZnS shell can effectively passivate the non-radiative recombination sites on the surface of Fe: ZnSe nanocrystal. When the shell thickness is too thick, the non-radiative recombination defects of ZnS shell will lead to the decrease of PL intensity.