期刊
JOURNAL OF LUMINESCENCE
卷 151, 期 -, 页码 106-110出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jlumin.2014.02.011
关键词
Nd3+; BaF2; Absorption; Laser excitation; Computer modelling; Defects in solids
类别
资金
- University of the Witwatersrand, Johannesburg
- Keele University
- Carnegie Corporation of New York
Absorption and site-selective laser spectroscopy of BaF2 single crystals homogeneously doped with Nd3+ ions as well as heterogeneously doped with Nd3+ and either Gd3+ or Yb3+ ions, performed at 10 K, is presented. In each case a single centre, assigned to be of C-3v symmetry, is dominant. A heterogeneous Nd3+-RE3+ (RE being either Nd or Yb) is also present in each of the double doped crystals. Energy levels for six multiplets of the single Nd3+ centre and for three multiplets for each Nd3+-RE3+ centre are presented together with the F-4(3/2) (R) multiplet fluorescence lifetime for each centre. Calculations give comparable solution energies for C-3v and C-4v symmetry Nd3+ centres in BaF2; the C-3v symmetry configuration has lower energy for the preceding lanthanides while C-4v, is favoured from Sm3+ onwards. (C) 2014 Elsevier B.V. All rights reserved.
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