Composition dependent frequency upconversion luminescence in Er-doped oxychloride germanate glasses |
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Authors: | Hongtao Sun Junjie Yang Junjie Zhang Zhonghong Jiang |
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Affiliation: | a Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China b Graduate School of the Chinese Academy of Sciences, Beijing 100039, People's Republic of China c Department of Histology and Embryology, the Second Military Medical University, Shanghai 200433, People's Republic of China |
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Abstract: | Er3+-doped oxychloride germanate glasses have been synthesized by conventional melting and quenching method. Structural and thermal stability properties were obtained based on the Raman spectra and differential thermal analysis, indicating that PbCl2 plays an important role in the formation of glass network and has an important influence on the maximum phonon energy and thermal stability of host glasses. Intense green and red emissions centered at 525, 546, and 657 nm, corresponding to the transitions 2H11/2→4I15/2, 4S3/2→4I15/2, and 4F9/2→4I15/2, respectively, were observed at room temperature. With increasing PbCl2 content, the intensity of green (525 and 546 nm) emissions increases significantly, while the red (657 nm) emission increases slowly. The results indicate that PbCl2 has more influence on the green emissions than the red emission in oxychloride germanate glasses. The possible upconversion luminescence mechanisms has also been estimated and discussed. |
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Keywords: | 78.20.&minus e 42.70.Ce 32.70.Cs 42.70.Hj |
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