6533b821fe1ef96bd127c0eb

RESEARCH PRODUCT

Photonic Crystals from Core-Shell Colloids with Incorporated Highly Fluorescent Quantum Dots

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description

We report the preparation of nanoscaled PS/PMMA core-shell spheres with highly fluorescent CdS/ZnS coated CdSe quantum dots (QDs) integrated in the core. Core-shell spheres of different diameters have been self-assembled to colloidal photonic crystals (PCs) with photonic stop bands located in the visible range of the electromagnetic spectrum. For the synthesis of the core, a modified miniemulsion polymerization has been used; the shell was prepared by a newly developed core-shell polymerization. The CdSe QDs embedded in the core were coated with the higher band gap semiconductor materials CdS and ZnS in a successive ion layer adsorption reaction (SILAR) keeping up the light-emitting properties of the QDs during the integration process. A modifying influence of the photonic band structure of the PC on the photoluminescence (PL) of the embedded QDs was observed by angular-dependent fluorescence measurements. The controlled combination of electronic confinement, originating from the QDs, and photon confineme...