  Colloidal semiconductor nanocrystals (SCNCs) or, more broadly, colloidal
quantum nanostructures constitute outstanding model systems for investigating
size and dimensionality effects. Their nanoscale dimensions lead to quantum
confinement effects that enable tuning of their optical and electronic
properties. Thus, emission color control with narrow photoluminescence spectra,
wide absorbance spectra, and outstanding photostability, combined with their
chemical processability through control of their surface chemistry leads to the
emergence of SCNCs as outstanding materials for present and next-generation
displays. In this Review, we present the fundamental chemical and physical
properties of SCNCs, followed by a description of the advantages of different
colloidal quantum nanostructures for display applications. The open challenges
with respect to their optical activity are addressed. Both photoluminescent and
electroluminescent display scenarios utilizing SCNCs are described.
