Abstract
Quantum dot (QD)–polymer composites were fabricated based on a solution ofQDs dispersed in an ionic liquid. Positively charged water-soluble nanocrystalswere obtained from solutions of CdSe/ZnS QDs dispersed in toluene by ligandexchange with 2-dimethylaminoethanethiol (DAET). The resulting QDs were furthertransferred into a hydrophobic ionic liquid HMITFSI (1-hexyl-3-methylimidazoliumbis(trifluoromethylsulfonyl)imide) by cation exchange, resulting in a CdSe/ZnS–HMITFSIsolution, which was used as a compatible medium for the polymerization and cross-linkingof polymethyl methacrylate networks. Transparent, fluorescent and flexible materialsresulted. The quantum yields of the composites depended on the initial properties of theQDs dispersed in toluene, and medium-size QDs (2.6 nm) resulted in the highest quantumyields.
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