Synthesis and photoluminescence of bright water-soluble CdSe/ZnS quantum dots overcoated by hybrid organic shell |
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| Authors: | Hsueh Shih Chen Masanori Ando Norio Murase |
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| Affiliation: | 1. Department of Fusion Chemical Engineering, Hanyang University, Ansan 426-791, Republic of Korea;2. Plant Engineering Center, Institute for Advanced Engineering (IAE), Yongin 449-863, Republic of Korea;3. Production Technology R&D Division, Korea Institute of Industrial Technology, Incheon 406-840, Republic of Korea |
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| Abstract: | Photoluminescence properties from water soluble CdSe/ZnS QDs encapsulated with hybrid trioctylphosphine-poly(acrylamide-co-acrylic acid)-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. |
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