Abstract
We synthesized (CdSe)ZnS quantum dot (QD)–polymethylmethacrylate (PMMA) polymercomposite and fabricated QD–polymer composite films. We produced the CdSe and(CdSe)ZnS QDs by direct colloidal chemical synthesis and the surface-passivationmethod—an overcoating of the dots with a larger-bandgap material. PMMA is transparentin the visible spectral range and was chosen as the embedding matrix for QDs. A28%(wt/wt) of PMMA in MMA was the most appropriate concentration to produce a film ofgood quality and maximize the solubility of quantum dots without phaseseparation 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 redlight emitting (CdSe)ZnS dots with PMMA of high optical transparency in thevisible region and spin-coating the composite solution. The fabricated green lightemitting (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∼35 nm. A white light emitting device can be fabricated by combining our green/red lightemitting 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 colouredwall-papers and full colour displays.
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