| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1647628 | Materials Letters | 2011 | 4 Pages |
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.
► Photoluminescence from polymer-coated CdSe/ZnS QDs has been investigated. ► PL efficiency of the QDs is increased 5-30% after coating with polymer. ► The exciton lifetime of the polymer-coated QDs increased 2-17 ns compared with that of CdSe/ZnS QDs.
