Optical properties of LiNbO3 : Cr crystals co-doped with Germanium oxide

E. Camarillo, H. Murrieta, J.M. Hernandez, R. Zoilo, M.C. Flores, T.P.J. Han, F. Jaque

Research output: Contribution to journalArticle

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Abstract

Lithium niobate (LiNbO3) crystals doped with chromium ions show a clear green colouring reflecting the absorption profile of the dominating [Cr](Li) defect centres. A significant change in its colouration takes place when it is co-doped with other valency impurities such as Mg2+, Sc3+ and W6+, above a certain threshold concentration. This concentration singularity has been attributed to the formation of [Cr](Nb) centres coexisting with the [Cr](Li) centres. In this work, we extended the investigation on the effect of co-dopant ions in Cr:LiNbO3 to tetravalent cation such as GeO2. A singularity in the relative intensity of the (4)A(2)-> T-4(1) and (4)A(2)-> T-4(2) absorption band was observed for a concentration of similar to 1.5 mol%, compared with 4.5 mol% for Mg2+. The photoluminescence emission spectra also reveal a new emission band, at a lower energy than the [Cr](Li) centre, corresponding to this threshold concentration. A charge compensation model is proposed to explain the role of cation impurities and results are compared with those of other valence impurities.
LanguageEnglish
Pages747-750
Number of pages3
JournalJournal of Luminescence
Volume128
Issue number5-6
DOIs
Publication statusPublished - May 2008

Fingerprint

germanium oxides
Optical properties
Impurities
optical properties
Crystals
Cations
impurities
Ions
crystals
Chromium
Coloring
cations
thresholds
Absorption spectra
Photoluminescence
lithium niobates
Doping (additives)
doped crystals
chromium
Defects

Keywords

  • absorption
  • luminescence
  • Cr
  • Ge
  • LiNbO3

Cite this

Camarillo, E., Murrieta, H., Hernandez, J. M., Zoilo, R., Flores, M. C., Han, T. P. J., & Jaque, F. (2008). Optical properties of LiNbO3 : Cr crystals co-doped with Germanium oxide. Journal of Luminescence, 128(5-6), 747-750. https://doi.org/10.1016/j.jlumin.2007.10.032
Camarillo, E. ; Murrieta, H. ; Hernandez, J.M. ; Zoilo, R. ; Flores, M.C. ; Han, T.P.J. ; Jaque, F. / Optical properties of LiNbO3 : Cr crystals co-doped with Germanium oxide. In: Journal of Luminescence. 2008 ; Vol. 128, No. 5-6. pp. 747-750.
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abstract = "Lithium niobate (LiNbO3) crystals doped with chromium ions show a clear green colouring reflecting the absorption profile of the dominating [Cr](Li) defect centres. A significant change in its colouration takes place when it is co-doped with other valency impurities such as Mg2+, Sc3+ and W6+, above a certain threshold concentration. This concentration singularity has been attributed to the formation of [Cr](Nb) centres coexisting with the [Cr](Li) centres. In this work, we extended the investigation on the effect of co-dopant ions in Cr:LiNbO3 to tetravalent cation such as GeO2. A singularity in the relative intensity of the (4)A(2)-> T-4(1) and (4)A(2)-> T-4(2) absorption band was observed for a concentration of similar to 1.5 mol{\%}, compared with 4.5 mol{\%} for Mg2+. The photoluminescence emission spectra also reveal a new emission band, at a lower energy than the [Cr](Li) centre, corresponding to this threshold concentration. A charge compensation model is proposed to explain the role of cation impurities and results are compared with those of other valence impurities.",
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Camarillo, E, Murrieta, H, Hernandez, JM, Zoilo, R, Flores, MC, Han, TPJ & Jaque, F 2008, 'Optical properties of LiNbO3 : Cr crystals co-doped with Germanium oxide' Journal of Luminescence, vol. 128, no. 5-6, pp. 747-750. https://doi.org/10.1016/j.jlumin.2007.10.032

Optical properties of LiNbO3 : Cr crystals co-doped with Germanium oxide. / Camarillo, E.; Murrieta, H.; Hernandez, J.M.; Zoilo, R.; Flores, M.C.; Han, T.P.J.; Jaque, F.

In: Journal of Luminescence, Vol. 128, No. 5-6, 05.2008, p. 747-750.

Research output: Contribution to journalArticle

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T1 - Optical properties of LiNbO3 : Cr crystals co-doped with Germanium oxide

AU - Camarillo, E.

AU - Murrieta, H.

AU - Hernandez, J.M.

AU - Zoilo, R.

AU - Flores, M.C.

AU - Han, T.P.J.

AU - Jaque, F.

PY - 2008/5

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N2 - Lithium niobate (LiNbO3) crystals doped with chromium ions show a clear green colouring reflecting the absorption profile of the dominating [Cr](Li) defect centres. A significant change in its colouration takes place when it is co-doped with other valency impurities such as Mg2+, Sc3+ and W6+, above a certain threshold concentration. This concentration singularity has been attributed to the formation of [Cr](Nb) centres coexisting with the [Cr](Li) centres. In this work, we extended the investigation on the effect of co-dopant ions in Cr:LiNbO3 to tetravalent cation such as GeO2. A singularity in the relative intensity of the (4)A(2)-> T-4(1) and (4)A(2)-> T-4(2) absorption band was observed for a concentration of similar to 1.5 mol%, compared with 4.5 mol% for Mg2+. The photoluminescence emission spectra also reveal a new emission band, at a lower energy than the [Cr](Li) centre, corresponding to this threshold concentration. A charge compensation model is proposed to explain the role of cation impurities and results are compared with those of other valence impurities.

AB - Lithium niobate (LiNbO3) crystals doped with chromium ions show a clear green colouring reflecting the absorption profile of the dominating [Cr](Li) defect centres. A significant change in its colouration takes place when it is co-doped with other valency impurities such as Mg2+, Sc3+ and W6+, above a certain threshold concentration. This concentration singularity has been attributed to the formation of [Cr](Nb) centres coexisting with the [Cr](Li) centres. In this work, we extended the investigation on the effect of co-dopant ions in Cr:LiNbO3 to tetravalent cation such as GeO2. A singularity in the relative intensity of the (4)A(2)-> T-4(1) and (4)A(2)-> T-4(2) absorption band was observed for a concentration of similar to 1.5 mol%, compared with 4.5 mol% for Mg2+. The photoluminescence emission spectra also reveal a new emission band, at a lower energy than the [Cr](Li) centre, corresponding to this threshold concentration. A charge compensation model is proposed to explain the role of cation impurities and results are compared with those of other valence impurities.

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KW - luminescence

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KW - Ge

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Camarillo E, Murrieta H, Hernandez JM, Zoilo R, Flores MC, Han TPJ et al. Optical properties of LiNbO3 : Cr crystals co-doped with Germanium oxide. Journal of Luminescence. 2008 May;128(5-6):747-750. https://doi.org/10.1016/j.jlumin.2007.10.032