Journal of the American Chemical Society · 2007 · 181 citations · 30 references
Natural SciencesChemistryMaterials ScienceColloid ScienceNanomaterialsOptical MaterialsLuminescent MaterialsNanostructured Electronic MaterialsOptical Properties Of SemiconductorsQuantum DotsSemiconductor Crystal GrowthSemiconductor NanomaterialsColloidal Quantum DotsColloidal Semiconductor NanocrystalsLuminescent NanomaterialsNanocrystal Growth MechanismsNanocrystalsPhotoluminescencePhotoluminescence Quantum YieldSize-dependent Luminescence
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.
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