The strong cross relaxation of Er3+ and yb3+ ions in the oxyfluoride glass ceramics |
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Authors: | Guangyin Zhang Lijuan Zhao Yanbing Hou Jingjun Xu Meiru Shang |
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Institution: | (1) Photonics Center, College of Physical Science, Nankai University, 300071 Tianjin, China;(2) Institute of Photon-Electron Technology, North Traffic University, 100044 Beijing, China |
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Abstract: | Oxyfluoride glass ceramic is a new up-conversion fluorescent material with the low phonon energy just like fluoride and the
good mechanical stability like oxide. In the oxyfluoride glass ceramics co-doped with Er3+ and yb3+ ions, the red radiation is dominant while it is excited by the violet light. But in the general fluorescent material, the
green radiation is dominant because the multi-phonon relaxation occurs step by step. The strong cross relaxation process of
Er3+ and yb3+ ions is mainly responsible for enhancement of the red radiation intensity in the oxyfluoride glass ceramics. The increase
of the red radiation intensity of Er3+ ions by the violet light excitation shows that the rare earth ions are doped into fluoride micro-crystals which are planted
into oxide host in the oxyfluoride glass ceramics. |
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Keywords: | oxyfluoride glass ceramics cross relaxation non-radiation relaxation |
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