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Quantum Dots (QDs) are semiconductor nanocrystals widely used in fluorescence imaging because of their bright photoluminescence and their controllable emission colour thorough size tailoring. Depending on their constituent material and size (typically below about 10 nm) QD luminescence can also be strongly temperature dependent, in such a way that its analysis can be used for thermal sensing at, potentially, the nanoscale. In this chapter we explain the basic principles of the thermal dependence of QD luminescence and we present relevant examples of how it can be used for sub-micrometric thermal sensing and imaging.

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