【摘要】 制备了核-壳结构的ZnS∶Cu/ZnS纳米粒子以及普通的没有壳的Cu2+掺杂的ZnS纳米粒子,研究了ZnS无机壳层对ZnS∶Cu纳米粒子发光性质的影响。透射电子显微镜、激发光谱和发射光谱的研究表明,后加入的Zn2+离子在已经形成的ZnS核表面生长,形成ZnS壳层;而适当厚度的ZnS壳层可以钝化粒子表面,减少无辐射复合中心的数目,抑制表面态对发光的不利影响,提高ZnS∶Cu纳米粒子中Cu2+离子在450 nm左右的发光强度。更多还原

【Abstract】 Core-shell structured ZnS∶Cu/ZnS nano-particles and Cu²⁺-doped ZnS nano-particles without any shell were prepared,and the effect of ZnS shell on the luminescence properties of ZnS∶Cu²⁺ nano-particles was studied.The observed emission peak at 450 nm was assigned to the recombination of an electron from the shallow delocalized donor levels at the t₂ level of Cu²⁺.The ZnS shell did enhance the luminescence at 450 nm,which resulted from the reduction of nonradiative recombination sites.更多还原