Photoluminescence of Ge nanoparticles embedded in SiO[sub 2] glasses fabricated by a sol–gel method

Yang, Heqing; Wang, Xingjun; Shi, Huazhong; Xie, Songhai; Wang, Fujian; Gu, Xiaoxiao; Yao, Xi
December 2002
Applied Physics Letters;12/30/2002, Vol. 81 Issue 27, p5144
Academic Journal
Ge nanoparticles with different sizes in silica glasses were prepared by a sol-gel method using Cl[sub 3]- Ge-C[sub 2]H[sub 4]- 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 < 1-2 nm with a molecular character instead of nanocrystalline Ge with the diamond structure.


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