Effect of crystalline fraction on upconversion luminescence in Er³⁺/Yb³⁺ Co-doped NaYF₄ oxyfluoride glass-ceramics

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• 作者：Yuan Gao^a ; Yuebo Hu^c ; Dacheng Zhou^a ; ^b ; Jianbei Qiu^a ; ^b ; ^{qiu@kmust.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Up-conversion emission ; Glass network modifier ; Crystallization activation energy ; NaYF4 nanocrystals ; Crystalline fraction
• 刊名：Journal of the European Ceramic Society
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：37
• 期：2
• 页码：763-770
• 全文大小：2770 K

文摘

The crystalline fraction were adjusted MgO concentration and the corresponding effect on upconversion (UC) luminescence in Er³⁺/Yb³⁺ co-doped NaYF₄ oxyfluorode glass-ceramics was investigated. With increase of MgO and the content of Na₂O reduced, the internal network structure of the glass became compact, which made the size of NaYF₄ nanocrystals unchanged, while the average distance between the nanocrystals increased significantly. Crystal growth is limited with the glass network, keeping the crystal size not changed. SNM-1 glass ceramics samples show a predominant red up-conversion emission under near infrared excitation at 980 nm, while a predominant green emission is observed in the SNM-3 samples. In this paper, it was indicated that it changed the effect of glass network modifier MgO in the glass structure. The possible mechanism responsible for the color variation of UC in Er³⁺/Yb³⁺ co-doped was discussed.