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Highly luminescent CdTe/CdSe colloidal heteronanocrystals with temperature-dependent emission color

By P.T.K. Chin, C. de Mello Donega, S.S. van Bavel, S.C.J. Meskers, N.A.J.M. Sommerdijk and R.A.J. Jansen


In this work we present the preparation of highly luminescent anisotropic CdTe/CdSe colloidal heteronanocrystals. The reaction conditions used (low temperature, slow precursor addition, and surfactant composition) resulted in a tunable shape from prolate to branched CdTe/CdSe nanocrystals. Upon CdSe shell growth the heteronanocrystals show a gradual evolution from type-I to type-II optical behavior. These heteronanocrystals show a remarkably high photoluminescence quantum yield (up to 82%) and negligible thermally induced quenching up to temperatures as high as 373 K

Year: 2007
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