Excitons and interconfigurational transitions in CaF2:Yb2+ crystals

被引：14
|
作者：
Hughes-Currie, Rosa B. [1 ]
Salkeld, Alexander J. [1 ]
Ivanovskikh, Konstantin V. [3 ,4 ]
Reid, Michael F. [1 ,2 ]
Wells, Jon-Paul R. [1 ]
Reeves, Roger J. [1 ,2 ]
机构：
[1] Univ Canterbury, Dept Phys & Astron, Christchurch 8140, New Zealand
[2] Univ Canterbury, MacDiarmid Inst Adv Mat & Nanotechnol, Christchurch 8140, New Zealand
[3] ANK Serv Ltd, Novouralsk 624131, Sverdlovsk Regi, Russia
[4] Ural Fed Univ, Ekaterinburg 620002, Russia
来源：
JOURNAL OF LUMINESCENCE | 2015年 / 158卷
关键词：
Exciton; Lanthanide; Ytterbium; CaF2; Synchrotron radiation; VUV spectroscopy; TEMPERATURE-DEPENDENCE; TRAPPED EXCITONS; LUMINESCENCE;
D O I：
10.1016/j.jlumin.2014.09.050
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A time-resolved VUV spectroscopic study of emission and excitation spectra of CaF2:Yb2+ has been performed to investigate excitation and relaxation mechanisms of both impurity-trapped excitons and intrinsic excitons in CaF2. Host-to-impurity energy transfer mechanisms leading to formation of impurity-trapped excitons have been discussed. The change in free exciton excitation peak position with increasing lattice temperature has been measured and is well approximated by Vina's expression for the temperature shift of a semiconductor band gap. The 4f(14)-> 4f(13)5d CaF2:Yb2+ absorption bands are successfully modeled with a semi-empirical effective Hamiltonian calculation. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：197 / 202
页数：6
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