Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10653525 | Solid State Communications | 2005 | 4 Pages |
Abstract
Tm3+/Yb3+-codoped germanate-niobic (GN) and germanium-bismuth (GB) glasses have been synthesized by conventional melting and quenching method. Intense blue and weak red emissions centered at 477 and 650Â nm, corresponding to the transitions 1G4â3H6 and 1G4â3H4, respectively, were observed at room temperature. The possible up-conversion mechanisms are discussed and estimated. GN glass showed a weaker up-conversion emission than GB glass, which is inconsistent with the prediction from the difference of maximum phonon energy between GN and GB glasses. In this paper, Raman spectroscopy was employed to investigate the origin of the difference in up-conversion luminescence in the two glasses. Compared with phonon side-band spectroscopy, Raman spectroscopy extracts more information including both phonon energy and phonon density. For the first time, our results reveal that, besides the maximum phonon energy, the phonon density of host glasses is also an important factor in determining the up-conversion efficiency.
Keywords
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Physical Sciences and Engineering
Materials Science
Materials Science (General)
Authors
Hongtao Sun, Chunlei Yu, Gang Zhou, Meisong Liao, Zhongchao Duan, Lili Hu, Junjie Zhang,