| Original Articles |
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Visible Upconversion Emission in Er3+-Doped GeO2-PbO-PbF2 Glass |
| YANG Zhong-Min;XU Shi-Qing;HU Li-Li;JIANG Zhong-Hong |
| Shanghai Institute of Optics and Fine Mechanics, Chinese
Academy of Sciences, Shanghai 201800 |
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| Cite this article: |
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YANG Zhong-Min, XU Shi-Qing, HU Li-Li et al 2003 Chin. Phys. Lett. 20 1347-1349 |
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Abstract The upconversion fluorescence emission of Er3+-doped 60GeO2-20PbO-20PbF2 glass was experimentally investigated under the pump of 976-nm laser diode. The results reveal the existence of intense emission bands centered around 524, 545, and 657 nm at room temperature. The green emission at 524 and 545 nm is due to the 4S3/2 + 2H11/2 → 4I15/2 transition and the red emission of 657 nm originates from the 4F9/2 → 4I15/2 transition of Er3+. The quadratic dependence of the green and red emissions on excitation power indicates that a two-photon absorption process occurs under the 976-nm excitation. The excited- state absorption from 4I11/2 and the cross relaxation between two Er3+ ions in the 4I11/2 state contribute to the green emission. The red emission at 657 nm is attributed to the excited-state absorption and cross relaxation processes in the 4I13/2 level as well as the 4S3/2 level nonradiative transition of Er3+.
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| Keywords:
73.61.Jc
78.20.-e
71.35.Fy
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Published: 01 August 2003
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| PACS: |
73.61.Jc
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(Amorphous semiconductors; glasses)
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78.20.-e
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(Optical properties of bulk materials and thin films)
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71.35.Fy
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