Microstructure and up-conversion luminescence properties of Er³⁺ and Yb³⁺ ions co-doped oxyfluoride silicates

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• 作者：Yunxin Liu ; Qibin Yang ; Guozhong Ren ; Changfu Xu ; Zhengang Shang ; Yong Zhang
• 关键词：Microstructure ; Luminescence ; SEM
• 刊名：Journal of Alloys and Compounds
• 出版年：2008
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：24 April 2008
• 卷：454
• 期：1-2
• 页码：379-383
• 文件大小：583 K

摘要

Microstructure and up-conversion luminescence properties of Er³⁺ and Yb³⁺ co-doped PbF₂–ZnF₂–SiO₂ oxyfluoride silicate were investigated. Up-conversion luminescence spectra consist of four bands centered at 408, 523, 541 and 660 nm which are similar to other Yb³⁺ and Er³⁺ co-doped up-conversion materials, but the violet emission near 408 nm accounting to 16.8%in overall intensity is much stronger than others. Another feature is that the change of the ratio of the intensity of the green to red emission is not monotonously. These phenomenon can be explained by micro dendrite crystal appeared in the as cast sample with 0.1 mol%Er³⁺. The dendrite crystal is identified to be β-PbF₂ by X-ray diffraction in which the content of rare-earth ions, Yb³⁺ and Er³⁺, is determined to be 7.0 mol%. The violet emission near 408 nm of the sample with the concentration of 0.1 mol%Er³⁺ decreased to 1.6%after the heat treatment because of the diminish of the dendrite.