Journal
NANOTECHNOLOGY
Volume 18, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/18/5/055402
Keywords
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Funding
- National Research Foundation of Korea [과06A1501, R11-2001-091-04001-0, R15-2003-032-01001-0, R15-2003-032-04002-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We synthesized ( CdSe) ZnS quantum dot ( QD) - polymethylmethacrylate ( PMMA) polymer composite and fabricated QD - polymer composite films. We produced the CdSe and ( CdSe) ZnS QDs by direct colloidal chemical synthesis and the surface-passivation method - an overcoating of the dots with a larger-bandgap material. PMMA is transparent in the visible spectral range and was chosen as the embedding matrix for QDs. A 28%( wt/wt) of PMMA in MMA was the most appropriate concentration to produce a film of good quality and maximize the solubility of quantum dots without phase separation of the QDs from the matrix. We fabricated green or red light emitting ( CdSe) ZnS QD - PMMA polymer composite film by combining the green or red light emitting ( CdSe) ZnS dots with PMMA of high optical transparency in the visible region and spin-coating the composite solution. The fabricated green light emitting ( CdSe) ZnS - PMMA composite film had a good quantum yield of 40% and a narrow emission band at 543 nm with a full width at half maximum of similar to 35 nm. A white light emitting device can be fabricated by combining our green/red light emitting QD - polymer composites with a blue light emitting LED as an excitation source. Our QD - polymer composites can be applied to flexible coloured filters, large-area coloured wall-papers and full colour displays.
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