On the origin of visible photoluminescence in nanometer-size Ge crystallites
Open Access
- 2 November 1992
- journal article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 61 (18) , 2187-2189
- https://doi.org/10.1063/1.108290
Abstract
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 photoluminescenceKeywords
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