Sharp photoluminescence of CdSeS nanocrystals embedded in silica glass

CdSeS nanocrystals were grown by annealing silica glass with supersaturated Cd, Se, S at temperatures of 550-800 degreesC. The linear absorption spectra, photoluminescence (PL) spectra, and photoluminescence excitation spectra were measured. Sharp PL peaks superposed on broadened PL spectra were observed at room temperature in the samples grown at temperatures of 650-800 degreesC. The sharp PL peak energy was independent of the excited energy and nanocrystal growth conditions. The origin of sharp luminescence is discussed. (C) 2003 American Institute of Physics.