Suppression of self-trapped exciton luminescence in La3+- and Nd3+-doped BaF2
- 8 June 1992
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 4 (23) , 5281-5290
- https://doi.org/10.1088/0953-8984/4/23/005
Abstract
The self-trapped exciton (STE) luminescence at 300 nm with a decay time of 620 ns in pure BaF2 can be suppressed by La3+ or Nd3+ doping. Crystals were studied with La concentrations ranging from 0.2 mol.% to 22 mol.% and Nd3+ concentrations between 0.15 and 11 mol.% X-ray induced emission spectra at temperatures from 90 K to 430 K and decay-time spectra are presented. Information about trapping of electrons by La3+ ions and the activation energy for thermal quenching of STE luminescence is obtained from a fit of the experimental data to a model calculation. The conclusions obtained for La3+ -doped crystals can also be employed for explaining similar aspects of the STE luminescence observed for the Nd3+ -doped BaF2 crystals.Keywords
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