The primary advantage of using fluorescent quantum dots (QDs) over traditional organic fluorochromes is their superior photostability and narrow, symmetric emission spectra. Quantum dots are semiconductor nanocrystals. When excited, they emit light of a very specific color (wavelength) that is determined precisely by their size. This results in emission peaks that are much narrower and more symmetric than the broad, often tailing, emission spectra of dyes like FITC or Texas Red. This property allows multiple QDs with different colors to be used simultaneously with minimal spectral overlap, enabling highly multiplexed imaging. Furthermore, QDs are extremely resistant to photobleaching—they can emit light for much longer periods under continuous illumination without fading. This allows for longer imaging times, repeated imaging of the same sample, and the collection of more data points, which is invaluable for live-cell imaging and for analyzing rare or faint signals. A single light source can also excite QDs of multiple colors, simplifying microscope setup.

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