Infrared-to-visible upconversion of rare-earth doped glass ceramics containing CaF2 crystals

被引：0
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作者：
Kishi, Yuki [1 ]
Tanabe, Setsuhisa [1 ]
机构：
[1] Graduate School of Human and Environment Studies, Kyoto University, Kyoto 606-8501, Japan
来源：
Journal of Alloys and Compounds | 1600年 / 408-412卷
关键词：
Oxy-fluoride glass ceramics containing CaF2 crystals doped with YbF3-LnF3 (Ln = Er; Tm) were prepared by heat-treatment from SiO2-Al2O3-CaO-CaF2 glasses. The upconversion emission spectra of Er3+ and Tm3+ ions in the visible range were measured by 970 nm pumping. In the spectrum of the Er doped sample; 540 nm upconversion band due to the 4S 3/2-4I15/2 and 660 nm band due to the 4F9/2-4I15/2 were observed. In the Tm doped sample; a blue upconversion emission band due to the 1G 4-3H6 was observed at 480 nm as well as an 800 nm band. The intensity of these upconversion emissions were very weak in the corresponding as-made glasses. These results indicate that rare-earth ions are incorporated in the CaF2 crystal phases after crystallization and the energy transfer efficiency from Yb3+ to Er3+ or Tm3+ are dramatically improved. © 2005 Elsevier B.V. All rights reserved;
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页码：842 / 844
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