摘要
采用微乳液法制备了掺Mn的ZnS纳米微粒并用CdS对其进行了表面修饰,以XRD、紫外吸收和发射光谱对其结构及光学性质进行了表征和研究。制得的纳米微晶粒径为4~6nm,为立方纤锌矿结构。与未经包覆的ZnS∶Mn纳米微粒相比,核壳结构的ZnS∶Mn/CdS纳米微粒中Mn2+发射峰的强度增强了很多,适当厚度的壳层的修饰可减少其表面态发射和非辐射跃迁,增强了Mn2+离子的4T1—6A1的能量传递和ZnS的带边发射,提高了发光效率;讨论了ZnS核中Mn掺杂浓度对ZnS∶Mn/CdS纳米微晶的光学性能的影响,发现当掺Mn浓度为4%时Mn2+发射峰的强度最大。
Mn2+ doped ZnS nanoparticles coated with a shell of CdS were prepared using microemulsion technique. The crystal structure and optical property of nanoparticles were characterized by XRD, UV absorption and photoluminescence spectroscopies. The size of nanoparticle is about 4-6 nm. The emission of nanoparticles peaked at 580nm which can be attributed to Mn2+ doping is much stronger than that of the uncoated ones. Mn2+ 4T1-6A1 yellow photoluminescence emission intensity of the coated ZnS:Mn is strongest while Mn2+ doping concentration is 4% and CdS shell thickness is 0.11 nm.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2005年第3期509-513,共5页
Journal of Synthetic Crystals
基金
教育部高等学校优秀青年教师教学科研奖励计划资助项目
关键词
核壳结构
ZNS:MN
米颗粒
乳液法
core-shell structure
Mn^(2+) doped ZnS
nanoparticle
microemulsion techique