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The synthesis and characterization of two bright white-light-emitting semiconductor nanocrystal (NC)-based systems is reported. CdS NCs emit white light because of the presence of surface states over the entire range of the visible spectrum, whereas CdSe/ZnS/CdSe/ZnS core/shell/shell/shell NCs are designed to emit white light as a result of the combination of blue and orange emissions from the shell and the core, respectively (see figure).
Sapra et al. (2007) studied this question.