采用微乳液法制备了核壳结构ZnS/CdS纳米微晶.以XRD、TEM表征其结构、粒度和形貌,UV、PL表征其光学性能.制得的纳米微晶近似呈球形,粒径4～5nm.研究了不同CdS壳层厚度的ZnS/CdS纳米微晶的光学性能,PL谱表明壳层CdS的修饰可减少ZnS的表面缺陷,表面态发射和非辐射跃迁减少,带边直接复合发光的几率增大,发光效率大大提高;在壳层CdS达到一定厚度时,PL谱却表现为CdS的特征发射,同时发现核心ZnS对壳层CdS的发光具有增强作用,提出了ZnS/CdS发光机理的能带模型.
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