When emitting semiconductor nanocrystals coated with a thin silica layer containing dispersed ions are heated, the emission efficiency is drastically increased along with a red-shift and a narrowing of the photoluminescence spectrum. Originally green-emitting CdTe nanocrystals change to red emission without a change in size (see image). This is ascribed to the formation of small clusters in the silica layer during heating.
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Murase et al. (2009) studied this question.
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