Photoluminescence of Ge nanoparticles embedded in SiO2 glasses fabricated by a sol–gel method

Ge nanoparticles with different sizes in silica glasses were prepared by a sol–gel method using Cl3–Ge–C2H4–COOH as a Ge source. The size of the Ge nanoparticles decreases with a reduction in the content of Ge in the starting materials, and thus the optical absorption edge shifts to a higher energy....

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Bibliographic Details
Published in:Applied physics letters 2002-12, Vol.81 (27), p.5144-5146
Main Authors: Yang, Heqing, Wang, Xingjun, Shi, Huazhong, Xie, Songhai, Wang, Fujian, Gu, Xiaoxiao, Yao, Xi
Format: Article
Language:English
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Summary:Ge nanoparticles with different sizes in silica glasses were prepared by a sol–gel method using Cl3–Ge–C2H4–COOH as a Ge source. The size of the Ge nanoparticles decreases with a reduction in the content of Ge in the starting materials, and thus the optical absorption edge shifts to a higher energy. Silica gel glasses doped with Ge nanoparticles showed a strong room-temperature photoluminescence with peaks at 568, 607, 672, 722, and 775 nm. The peak position of photoluminescence spectrum scarcely depends on the Ge/Si ratio. However, the photoluminescence intensity increases sharply as the Ge/Si ratio is reduced. The photoluminescence arises from the Ge clusters of diameter of
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1506943