16 September 2011 Effect of alloying on the photoluminescence of the CuInS2 nanocrystals
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We have developed a novel route to highly luminescent Cd-free core-shell nanocrystals. By simply refluxing assynthesized CuInS2 nanocrystals with zinc acetate and palmitic acid, highly luminescent CuInS2/ZnS nanocrystals were synthesized. We modified the photoluminescence of the grown nanocrystal by alloying foreign atoms. Nanocrystals with alloyed cores were synthesized by adding selenium and nanocrystals with alloyed shell layers were synthesized by refluxing the as-synthesized CuInS2 nanocrystals with mixture of cadmium acetate, zinc acetate and palmitic acid. It was found that the emission wavelength of the nanocrystals was shifted to longer wavelength side by alloying. The photoluminescence spectra showed clear red-shift without significant minimization of emission intensity. A Detailed study on the emission process of nanocrystals implies that the formation of shell layers with small lattice mismatch minimized mismatch strain generated from the shell layers in contrast to core alloyed nanocrystals.
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Young-Kuk Kim, Young-Kuk Kim, Chul-Jin Choi, Chul-Jin Choi, "Effect of alloying on the photoluminescence of the CuInS2 nanocrystals", Proc. SPIE 8098, Physical Chemistry of Interfaces and Nanomaterials X, 809813 (16 September 2011); doi: 10.1117/12.892904; https://doi.org/10.1117/12.892904

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