Mechanism of fluorescence energy transfer in aqueous solution cadmium sulfide quantum dots

被引:0
|
作者
Hou, Shili [2 ]
Mao, Huibing [2 ]
Wang, Jiqing [2 ]
Zhu, Ziqiang [2 ]
Jing, Weiping [1 ]
机构
[1] Nantong Univ, Jiangsu Prov Key Lab ASIC Design, Nantong 226007, Peoples R China
[2] E China Normal Univ, Dept Elect Engn, Shanghai 200241, Peoples R China
来源
关键词
LIGHT-EMITTING-DIODES; CDS NANOCRYSTALS; PBS; NANOPARTICLES;
D O I
10.1007/s00339-008-4785-7
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Cadmium sulfide (CdS) quantum dots (QDs) prepared by a convenient chemical method have been characterized using absorption, fluorescence, and photoluminescence excitation techniques. The photoluminescence excitation studies show that there is an electron transfer from the surface adsorbate (thiourea) to CdS QDs in aqueous solution. The excitation band with peak maximum at 5.8 eV is assigned to the electronic transitions in the chemisorbed thiourea, whereas the excitation band between 3.45 and 3.7 eV corresponds to the band-to-band transition within the nanocrystalline CdS host. The absorption spectroscopy of the CdS QD solutions shows a strong absorption peak which is generated from thiourea. The band-edge fluorescence of the CdS QDs has also been investigated. It is shown that the fluorescence property of the CdS QDs can be enhanced by adding cadmium chloride (CdCl2) solution.
引用
收藏
页码:795 / 797
页数:3
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