Description:

Semiconductor nanocrystals, also called colloidal quantum dots, typically have a size between ~1 and 10 nm and lie in the transition regime between bulk solids and molecules. They are fascinating objects for studying basic novel properties of matter, generally described by the term "size quantization effect". A famous demonstration of the size-dependent properties of semiconductor nanocrystals is the continuous change of their emission color. Shown is an example of the range of CdSe nanocrystal emission spectra.

Most nanocrystals are highly luminescent, and the emission is tunable through the whole visible and the near-IR spectral range by controlling the composition and size of quantum dots. Highly luminescent semiconductor nanocrystals are interesting for different applications, ranging from thin film optoelectronic devices to fluorescent labels. The incorporation of luminescent semiconductor nanocrystals into photonic crystals and microcavities has attracted considerable attention as a promising pathway to novel light sources with controllable spontaneous emission.

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