Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1494579 | Optical Materials | 2013 | 7 Pages |
Abstract
Single crystals of Pr3+-doped γ-BiB3O6 of optical quality were grown. Band gap is 4.16 eV at 80 K, which differs only slightly from that for undoped samples. Pr concentration is 2 Ã 1020 cmâ3 and the dopant is distributed uniformly along the crystal. Absorption cross-section for Pr3+ was estimated to be â¼1 Ã 10â20 cm2. At X-ray and UV, band-to-band excitation the Pr:γ-BiB3O6 crystals demonstrate an intense emission in the 450 nm broad band, which is related mainly to recombination of self-trapped excitons (STE). A part of energy is transferred radiatively to Pr3+ ions. The STE emission quenches as temperature increases to 250 K with simultaneous decrease of the decay time from 11 μs to 17 ns. Intensity and decay time of the Pr3+ intracenter luminescence with Ï â¼Â 50 μs at 450 nm excitation do not depend on temperature. Intensity of thermoluminescence in the 150-400 K range quenches 2 orders at Pr doping, and parameters of the traps were estimated. As a result of relatively narrow band gap in γ-BiB3O6:Pr3+, there is no cascade luminescence typical of many wide-band-gap matrices.
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Authors
A. Yelisseyev, L. Isaenko, V. Korolev, V. Stoyanovsky, V. Gets, D. Naumov, O. Ilyina,