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Growth and spectroscopic properties of CaxSr1-xF2: Sm: Gd single crystals.

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Title: Growth and spectroscopic properties of CaxSr1-xF2: Sm: Gd single crystals.
Authors: Xu, Chonglei1,2 (AUTHOR), Strzep, Adam1,3 (AUTHOR) a.strzep@intibs.pl, Zhang, Zhonghan1,2 (AUTHOR), Kou, Huamin1,2 (AUTHOR), Ma, Fengkai1,4 (AUTHOR), Su, Liangbi1,2 (AUTHOR) suliangbi@mail.sic.ac.cn
Source: Journal of Luminescence. Sep2022, Vol. 249, pN.PAG-N.PAG. 1p.
Subjects: Samarium, Single crystals, Energy transfer, Absorption spectra, Solid solutions, Luminescence
Abstract: Eight single crystals of Ca x Sr 1-x F 2 : Sm, Gd solid state solutions were grown by modified temperature gradient technique. Their spectroscopic properties were studied at 300 K and 77 K. The absorption spectra at room and LN 2 temperatures suggest that there are more types of clusters in CaF 2 rather than SrF 2 samples (when the Sm3+ concentration is kept below 0.1 at.%). The addition of Gd3+ does not alter Sm2+/Sm3+ ratio significantly. Co-doping of samples with Gd3+ lead to significant changes in absorption and, emission and luminescence kinetic characteristics of Sm3+ ions. Changes in luminescent properties are due to creation of Sm x Gd y F z clusters. Presence of Clusters can also be confirmed by effective Energy Transfer from Gd3+ to Sm3+ ions. • Sm, Gd co-doping crystals grown by temperature gradient technique. • Samarium exists as both divalent and trivalent ions, the spectral properties were investigated fully at 300K and 77K. • Efficient energy transfer between Gd3+ and Sm3+, while no energy transfer between Gd3+ and Sm2+ nor between Sm3+ and Sm2+. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:Eight single crystals of Ca x Sr 1-x F 2 : Sm, Gd solid state solutions were grown by modified temperature gradient technique. Their spectroscopic properties were studied at 300 K and 77 K. The absorption spectra at room and LN 2 temperatures suggest that there are more types of clusters in CaF 2 rather than SrF 2 samples (when the Sm3+ concentration is kept below 0.1 at.%). The addition of Gd3+ does not alter Sm2+/Sm3+ ratio significantly. Co-doping of samples with Gd3+ lead to significant changes in absorption and, emission and luminescence kinetic characteristics of Sm3+ ions. Changes in luminescent properties are due to creation of Sm x Gd y F z clusters. Presence of Clusters can also be confirmed by effective Energy Transfer from Gd3+ to Sm3+ ions. • Sm, Gd co-doping crystals grown by temperature gradient technique. • Samarium exists as both divalent and trivalent ions, the spectral properties were investigated fully at 300K and 77K. • Efficient energy transfer between Gd3+ and Sm3+, while no energy transfer between Gd3+ and Sm2+ nor between Sm3+ and Sm2+. [ABSTRACT FROM AUTHOR]
ISSN:00222313
DOI:10.1016/j.jlumin.2022.119008