Type-II core/shell quantum dots are characterized by a staggered alignment of conduction and valence bands (see Figure), giving rise to a broad tunability of absorption and emission wavelengths. Colloidal ZnTe/CdE (E = S, Se, Te) core/shell quantum dots have been prepared with emission quantum yields of up to 30 %. The synthesis route presented should be applicable to other type-II core/shell quantum dots.
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Xie et al. (2005) studied this question.
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