Optical studies of the partially disordered crystals langasite (La3Ga5SiO14) and langatate (La3Ga5.5Ta0.5O14) doped with Eu3+

S. Georgescu; O. Toma; A. Achim; A. M. Chinie; L. Gheorghe; A. Stefan

doi:10.1117/12.755506

1 August 2007 Optical studies of the partially disordered crystals langasite (La₃Ga₅SiO₁₄) and langatate (La₃Ga_5.5Ta_0.5O₁₄) doped with Eu³⁺

S. Georgescu, O. Toma, A. Achim, A. M. Chinie, L. Gheorghe, A. Stefan

Author Affiliations +

Proceedings Volume 6785, ROMOPTO 2006: Eighth Conference on Optics; 678509 (2007) https://doi.org/10.1117/12.755506
Event: ROMOPTO 2006: Eighth Conference on Optics, 2006, Sibiu, Romania

Abstract

We analyze, using the fluorescence spectroscopy of Eu³⁺, two partially disordered crystals from the langasite family: langasite and langatate. There are two main differences between these crystals: (a) the randomly occupied positions (Ga³⁺ - Si⁴⁺ in tetrahedral positions for langasite and Ga³⁺ - Ta ⁵⁺ in octahedral positions for langatate) and (b) the charge difference between the ions in these positions (1e for langasite and 2e for langatate). For LGS:Eu, the presence of multiple fluorescent centers could not be evidenced, while for LGT:Eu the splitting of the fluorescence lines clearly indicates the presence of multiple fluorescent centers.

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S. Georgescu, O. Toma, A. Achim, A. M. Chinie, L. Gheorghe, and A. Stefan "Optical studies of the partially disordered crystals langasite (La₃Ga₅SiO₁₄) and langatate (La₃Ga_5.5Ta_0.5O₁₄) doped with Eu³⁺", Proc. SPIE 6785, ROMOPTO 2006: Eighth Conference on Optics, 678509 (1 August 2007); https://doi.org/10.1117/12.755506

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