Pairs and nonequivalent Pr3+ sites in GGG

Aurelia Lupei; H. Gross; Peter Reiche

doi:10.1117/12.238090

11 April 1996 Pairs and nonequivalent Pr₃+ sites in GGG

Aurelia Lupei, H. Gross, Peter Reiche

Proceedings Volume 2772, Laser Optics '95: Solid State Lasers; (1996) https://doi.org/10.1117/12.238090
Event: Laser Optics '95, 1995, St. Petersburg, Russian Federation

Abstract

Spectral data on Pr³⁺ ion in Czochralski grown GGG Gd₃Ga₅O₁₂) crystals are analyzed. Pr³⁺ spectra, investigated by high resolution absorption, site selective excitation and emission contain besides the main lines assigned to Pr³⁺ in dodecahedral c-sites, at least four other types of non-equivalent centers. Three satellites have been assigned to Pr³⁺ in dodecahedral c-sites perturbed by a non-stoichiometric defect, Gd³⁺ in octahedral sites, whose concentration was estimated from absorption. A reduction of local symmetry is observed from the spectra. It is connected with X-ray measurements that show forbidden {222} reflections in cubic ideal garnets, but with similar small intensities. Other lines are assigned to Pr³⁺(c)- Pr³⁺(c) near pairs, one of them showing a very strong quenching of ³P₀ emission. Some of the mechanisms of ³P₀ emission quenching and their influence on quantum efficiency are discussed.

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Aurelia Lupei, H. Gross, and Peter Reiche "Pairs and nonequivalent Pr₃+ sites in GGG", Proc. SPIE 2772, Laser Optics '95: Solid State Lasers, (11 April 1996); https://doi.org/10.1117/12.238090

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KEYWORDS

Absorption

Ions

Garnet

Satellites

Crystals

Luminescence

X-rays

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