Optical stability of the Cr3+ centres in codoped stoichiometric and congruent LiNbO3 : Cr : Mg
Han, T. P. J. and Jaque, Francisco (2007) Optical stability of the Cr3+ centres in codoped stoichiometric and congruent LiNbO3 : Cr : Mg. Optical Materials, 29 (8). pp. 1041-1043.
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The optical stability of the R-lines and broad band associated with the Cr3+ ions has been studied in codoped congruent and near stoichiometric LiNbO3:Cr:Mg crystals. It has been found that the E-2 -> (4)A(2) transition of the Cr3+ ions located in Nb5+ sites, [Cr](Nb), can be bleached under optical excitation of the high energy broad absorption band luminescence whereas the emission from the same transition but ascribed to Cr3+ ions located in Li+ sites, [Cr](Li), is optically stable. At variance, the broad emission associated with the T-4(2) -> (4)A(2) vibronic transition ascribed to these centres is optically stable. The recovery temperature for the optical bleaching has been found to be 150 K, and has been correlated to Nb4+ electron traps located in Nb5+ antisite position. The different optical stability found for the R-lines and broad band emission associated with the [Cr](Nb) sites confirm the existence of two [Cr]Nb centres with low and high crystal field, respectively. (c) 2006 Elsevier B.V. All rights reserved.
| Item type: | Article |
|---|---|
| ID code: | 31038 |
| Keywords: | crystals, luminescence, spectroscopy, Optics. Light, Electronic, Optical and Magnetic Materials, Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Computer Science(all) |
| Subjects: | Science > Physics > Optics. Light |
| Department: | Faculty of Science > Physics |
| Depositing user: | Pure Administrator |
| Date deposited: | 21 Jun 2011 12:17 |
| Last modified: | 03 Jan 2019 12:55 |
| URI: | https://strathprints.strath.ac.uk/id/eprint/31038 |
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