Synthesis and photoluminescence of bright water-soluble CdSe/ZnS quantum dots overcoated by hybrid organic shell

被引：12
|
作者：
Chen, Hsueh Shih [1 ]
Ando, Masanori [1 ]
Murase, Norio [1 ]
机构：
[1] Natl Inst Adv Ind Sci & Technol, Hlth Res Inst, Ikeda, Osaka 5638577, Japan
来源：
MATERIALS LETTERS | 2011年 / 65卷 / 19-20期
关键词：
CdSe; Quantum dot; Poly(acrylamide-co-acrylic acid); Photoluminescence; Efficiency; Lifetime; NANOCRYSTALS; LUMINESCENCE; ZNSE;
D O I：
10.1016/j.matlet.2011.06.109
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Photoluminescence properties from water soluble CdSe/ZnS QDs encapsulated with hybrid trioctylphosphine-poly(acrylamide-co-acrylicacid)-ethanolamine (TOPO-PSMA-EA) shell have been investigated. It was found that PL efficiency of CdSe/ZnS QDs in water was increased 5-30% after introducing PSMA-EA polymers to encapsulate CdSe/ZnS-TOPO QDs. Higher PSMA concentrations were found to enhance the PL efficiency of QDs up to 1.8 folds, which is ascribed to a better packing and passivation of the TOPO-PSMA-EA shell over the QDs. Time-resolved photoluminescence suggested that the mean lifetime of photoexcited carriers in the water-soluble CdSe/ZnS-TOPO-PSMA-EA QDs elongated 2-17 ns compared with that of uncoated samples. indicating that PL quenching defects were effectively removed for CdSe/ZnS QDs with hybrid TOPO-PSMA-EA shell. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：3146 / 3149
页数：4
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