A multicolor electronic display is based on an array of luminescent semiconductor nanocrystals. Nanocrystals which emit light of different colors are grouped into pixels. The nanocrystals are optically pumped to produce a multicolor display. Different sized nanocrystals are used to produce the different colors. A variety of pixel addressing systems can be used.
 This invention was made with U.S. Government support under Contract No. DE-AC03-76SF0098 between the U.S. Department of Energy and the University of California for the operation of LAWRENCE BERKELEY NATIONAL LABORATORY (LBNL). The U.S. Government may have certain rights to this invention.