Energy transfer upconversion in Ho3+ and Ho3+, Yb3+ doped CdF2 crystals

被引:34
作者
Zhang, X [1 ]
Jouart, JP
Mary, G
机构
[1] Chinese Acad Sci, Changchun Inst Phys, Lab Excited State Proc, Changchun 130021, Peoples R China
[2] Univ Reims, GRSM, Lab Energet & Opt, F-51687 Reims, France
关键词
D O I
10.1088/0953-8984/10/2/027
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
A comparative spectroscopic study for Ho3+ and Ho3+, Yb3+ doped CdF2 crystals has been realised at liquid nitrogen temperature. The Ho3+ single-doped sample shows principally blue emission corresponding to the F-5(3) --> I-5(8) transition, whereas the Ho3+, Yb3+ codoped sample gives rise to a very efficient green emission which is ascribed to the F-5(4), S-5(2) --> I-5(8) transition. The total integrated upconversion emission intensity (including blue and green emissions) for the codoped crystal is three times more intense than that of the Ho3+ doped one, while the ratio for green emission rises to 27. The green emission in the codoped sample results mainly from the Ho3+-Yb3+ mixed centre, whereas the blue emission is essentially due to the Ho3+-Ho3+ pair. Two energy transfer upconversion mechanisms have been proposed and are discussed in the paper.
引用
收藏
页码:493 / 500
页数:8
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