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We have studied the origin of visible photoluminescence of Ge nanocrystals in SiOZ glassymatrix. Spectroscopic analyses of Ge nanocrystals indicate that the room-temperaturephotoluminescence comes from Ge nanocrystals of diameter of 4 nm or less. High-resolutionelectron microscopic studies imply that the structure of Ge nanocrystals of diameter <4 nmdiffers from the diamond structure. These data suggest that new nanostructure crystalline Gehaving a character of direct optical transition exhibits the visible photoluminescence

On the origin of visible photoluminescence in nanometer-size Ge crystallites