Ln2+ stabilization in strontium borates

Sm2O3‐doped SrO–BaO–P2O5–B2O3 glass was prepared by a conventional melt quenching method in air. The glass was irradiated using X‐rays to reduce the Sm3+ ions to Sm2+ ions. After the X‐ray irradiation, photoluminescence studies at different temperatures showed that the conversion of Sm3+ to Sm2+ could be realized in this alkaline earth borophosphate glass. The luminescence of the Sm2+ ions showed a strong dependence on temperature. Photo‐stability of Sm2+ ion was evaluated using a photo‐bleaching method. Thermo‐luminescence and life‐time measurements were also investigated. The results of this study could be useful for understanding the reduction mechanism of Sm3+ ions to Sm2+ ions in alkaline earth borophosphate glass.

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“…The total defect reaction is given in the following equation, which could create an Sm 2+ ion and a hole center of O − 30 : …”

Section: Resultsmentioning

confidence: 99%

Temperature‐Dependent ⁵D₀→⁷F₀ Luminescence of Sm²⁺ Ions Doped in Alkaline Earth Borophosphate Glass

Wang

Huang

et al. 2010

Journal of the American Ceramic Society

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“…Such electrons may traverse in the lattice depending upon their energy and the composition and are finally trapped. There are many possible defects, which may be due to the intrinsic factors or extrinsic effects of rare earth doping, such as a hole center of O − 30 . In S–H, the Sm ions were doped in Ba 3 BP 3 O 12 matrix as Sm 2+ states during the sample preparation process, hence the Sm 2+ ions are more chemically stable than those in S–X produced by X‐ray irradiation.…”

Section: Discussionmentioning

confidence: 99%

The Reduction and Luminescence Characteristics of Sm2+ Doped in Ba3BP3O12 Crystal

Wang¹,

Huang²,

Li³

et al. 2011

Journal of the American Ceramic Society

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Sm2+ ions doped in Ba3BP3O12 polycrystalline samples were obtained by heating the materials in a reducing atmosphere and X‐ray irradiation reduction method. The phase formations of the samples were investigated by X‐ray powder diffraction measurements. The temperature‐dependent emission spectra and luminescence decay curves of Sm2+ ions reduced by the two methods were investigated at various temperatures (10–300 K). The crystallographic site distributions and the thermal quenching of 5D0→7F0 luminescence transition of Sm2+ ions in the two samples have different characteristics. The photostabilities of the Sm2+ ions were evaluated with the photobleaching method by monitoring the 5D0→7F0 luminescence transition under the excitation of 488 nm of Ar+ laser. The luminescence and reduction mechanism of Sm3+→Sm2+ were discussed. The luminescence properties and stabilities of the Sm2+ ions are highly dependent on the sample preparation conditions.

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“…Chenot [5] synthesized the SrO · 3B 2 O 3 compound for the first time by dehydration of the crystal hydrate of the same stoichiometry. It is this technique, i.e., the decomposition of the corresponding crystal hydrate, that was used to prepare the polycrystalline strontium triborate doped with lanthanides for the study of luminescence [2,12]. However, Kudrjavtcev et al [8] most likely prepared the strontium triborate SrO · 3B 2 O 3 through the solid-phase synthesis but, possibly, in a mixture with strontium diborate.…”

Section: Introductionmentioning

confidence: 98%

“…The analysis of the data available in the literature demonstrates that one more similar compound exists in the system under consideration. According to Pir et al [2], the solid-phase synthesis does not make it possible to prepare the pure strontium triborate SrO · 3B 2 O 3 . This is in agreement with the results obtained in the classical works [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…This results in a great variety of spectral luminescence characteristics. In particular, strontium metaborate and strontium pyroborate involve triply charged lanthanide ions [1], and some of them in the form of doubly charged ions efficiently luminesce in the composition of strontium diborate and strontium triborate [2]. Strontium diborate crystals doped with lanthanide ions hold promise as active laser materials.…”

Section: Introductionmentioning

confidence: 99%

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Crystallization of glasses in the SrO-B2O3 system

Polyakova

Litovchik

2008

Glass Phys Chem

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The crystallization of strontium borate glasses containing 16.7-43.0 mol % SrO is investigated. New crystalline compounds of the hypothetical compositions 2SrO · 3B 2 O 3 (metastable) and SrO · 5B 2 O 3 (stable below 750 ° C), as well as the metastable diborate modification β -SrO · 2B 2 O 3 , are revealed, and their X-ray powder diffraction data are obtained. It is demonstrated that, with a deficit of strontium oxide, the 4SrO · 7B 2 O 3 compound forms solid solutions. Strontium triborate SrO · 3B 2 O 3 , which was previously prepared only through the dehydration of crystal hydrates, is produced using crystallization of glasses. The thermal stability of this compound is studied. The influence of the dispersity on the stability of different crystalline phases is discussed. Variants of the phase diagram for the SrO · B 2 O 3 -B 2 O 3 system in the case of monolithic and dispersed samples are proposed from analyzing the experimental results and the data available in the literature.

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Ln2+ stabilization in strontium borates

Cited by 13 publications

References 14 publications

Temperature‐Dependent ⁵D₀→⁷F₀ Luminescence of Sm²⁺ Ions Doped in Alkaline Earth Borophosphate Glass

Temperature‐Dependent ⁵D₀→⁷F₀ Luminescence of Sm²⁺ Ions Doped in Alkaline Earth Borophosphate Glass

The Reduction and Luminescence Characteristics of Sm2+ Doped in Ba3BP3O12 Crystal

Crystallization of glasses in the SrO-B2O3 system

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Ln2+ stabilization in strontium borates

Cited by 13 publications

References 14 publications

Temperature‐Dependent 5D0→7F0 Luminescence of Sm2+ Ions Doped in Alkaline Earth Borophosphate Glass

Temperature‐Dependent 5D0→7F0 Luminescence of Sm2+ Ions Doped in Alkaline Earth Borophosphate Glass

The Reduction and Luminescence Characteristics of Sm2+ Doped in Ba3BP3O12 Crystal

Crystallization of glasses in the SrO-B2O3 system

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Temperature‐Dependent ⁵D₀→⁷F₀ Luminescence of Sm²⁺ Ions Doped in Alkaline Earth Borophosphate Glass

Temperature‐Dependent ⁵D₀→⁷F₀ Luminescence of Sm²⁺ Ions Doped in Alkaline Earth Borophosphate Glass