Evolution of the spectral characteristics upon annealing of lithium borate glasses containing europium and aluminum

Шмурак, С. З.; Кедров, В. В.; Kiselev, A. M.; Зверькова, И. И.

doi:10.1134/s1063783413020261

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…The unambiguous correspondence between the luminescence spectra of borates of rare-earth elements and their structural state makes it possible to control the spectral characteristics of borates in a directed way by changing their structure [1][2][3][4][5][6][7][8][9]. Since borates can be used as effective phosphors for LED light sources, the study of methods for directional changes in their spectral characteristics is of considerable interest.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Spectral and Structural Characteristics of Orthoborates Lu0.99 – xGdxEu0.01BO3

et al. 2021

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The structure, IR absorption and luminescence spectra of solid solutions of Lu 0.99 -x Gd x Eu 0.01 BO 3 at 0 ≤ x ≤ 0.15 were studied. The correspondence between the structure and spectral characteristics of these compounds was established. It is shown that at x ≤ 0.05, the orthoborates Lu 0.99 -x Gd x Eu 0.01 BO 3 , consisting of lutetium borate LuBO 3 , which has two stable structural modifications (calcite and vaterite), and gadolinium borate GdBO 3 , which has only one structural modification (vaterite), form a solid solution with a calcite structure and a microcrystal size of 15-20 μm. As x increases, the amount of vaterite phase increases sequentially, and at x ≥ 0.1, the entire volume of the sample has a vaterite structure. At Gd 3+ concentration in the range of 0.05 < x ≤ 0.1, the samples of Lu 0.99 -x Gd x Eu 0.01 BO 3 are two-phase. It is shown for the first time that at x > 0.05, the vaterite phase appears both in the volume of large microcrystals (15-20 μm) and in the form of small microcrystals (1-2 μm).

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Section: Introductionmentioning

confidence: 99%

Evolution of Spectral and Structural Characteristics of Orthoborates Lu0.99 – xGdxEu0.01BO3

et al. 2021

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“…Understanding this complex polymorph mixing requires spatially resolved techniques. Though several photoluminescence studies on RX 3 (BO 3 ) 4 have been conducted, ,− none has mapped behavior across a crystal to assess inhomogeneity. The effects of polymorph domains should readily be seen through changes in the 5 D 0 → 7 F 1 transition of Eu 3+ .…”

Section: Resultsmentioning

confidence: 99%

Stacking Sequences of Coherent EuAl₃(BO₃)₄ Polymorphs Define Local Eu³⁺ Symmetry and Control Access to Quantum Information Storage

Riedel

Pan

Woods

et al. 2023

Crystal Growth & Design

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Stoichiometric rare-earth materials have demonstrated extremely narrow inhomogeneous photoluminescence-excitation linewidths because the rare-earth cations occupy uniform crystallographic sites. These narrow linewidths make them strong candidates for quantum information storage by providing access to transitions with extremely long coherence times on the order of hours. Determining the chemical origins of defects that may broaden linewidths and reduce performance is an important step toward exploiting stoichiometric systems’ advantages. Here, we present EuAl3(BO3)4 as a system for defect-performance correlation studies since it can be grown as optically transparent single crystals and has a large Eu–Eu separation. Large crystals grown from two flux systems incorporate percent-level substitutions of flux cations. Additionally, the material’s three polytypic modifications, including the newly detailed C2/c space group polymorph, can coexist within single crystals. The sharply divided polymorph domains are revealed by photoluminescence mapping. Polymorph domains are also present in EuAl3(BO3)4 samples produced flux-free by microwave-assisted sintering in only 45 min. We anticipate that these mapping studies will be a crucial step in the quest to identify local heterogeneity (substitutions, polymorphs, strain, etc.) in the next generation of quantum information storage materials.

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“…LS of La 0.99 Sc 7, spectrum 2; Figure 8, spectrum 2). Note that the luminescence spectrum of EuAl 3 (BO 3 ) 4 europium alumoborate with huntite structure studied in [59,60] contains bands 591, 596 nm ( 5 D 0 → 7 F 1 ); 613, 618 nm ( 5 D 0 → 7 F 2 ); ∼ 650 nm ( 5 D 0 → 7 F 3 ); 699, 704 nm ( 5 D 0 → 7 F 4 ). Bands with λ max = 613 and 618 nm have the highest intensity.…”

Section: Spectral Characteristics Of Boratesmentioning

confidence: 99%

Evolution of the spectral and structural characteristics of borates formed during the interaction of lanthanum and scandium oxides with a potassium tetraborate melt

Shmurak S.Z.,

Kedrov V.V.,

Kiselev A.P.

et al. 2023

Physics of the Solid State

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The structure, morphology, IR spectra, as well as luminescence spectra and luminescence excitation spectra of europium-doped borates formed during the interaction of lanthanum and scandium oxides with a potassium tetraborate melt at 970oC with the general formula La0.99-xScxEu0.01BO3 were studied. It is shown that with an increase in the Sc3+ concentration, three compounds are successively formed: LaBO3, LaSc3(BO3)4, and ScBO3. At 0≤ x≤ 0.26, the samples are single-phase and have the structure of LaBO3 aragonite. Within the range of 0.26<x<0.75, the samples are two-phase and contain the structures of LaBO3 aragonite and LaSc3(BO3)4 huntite. At 0.75≤ x≤0.85, LaSc3(BO3)4 is observed. Within the range of 0.85<x≤0.97, the samples are two-phase and consist of LaSc3(BO3)4 huntite and ScBO3 calcite. At 0.97<x≤0.99, the ScBO3 samples have a calcite structure. Correspondence between the structure and spectral characteristics of these compounds was established. Keywords: phosphors for LEDs, rare earth orthoborates, X-ray diffraction analysis, IR spectroscopy, luminescence spectra.

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Evolution of the spectral characteristics upon annealing of lithium borate glasses containing europium and aluminum

Cited by 11 publications

References 16 publications

Evolution of Spectral and Structural Characteristics of Orthoborates Lu0.99 – xGdxEu0.01BO3

Evolution of Spectral and Structural Characteristics of Orthoborates Lu0.99 – xGdxEu0.01BO3

Stacking Sequences of Coherent EuAl₃(BO₃)₄ Polymorphs Define Local Eu³⁺ Symmetry and Control Access to Quantum Information Storage

Evolution of the spectral and structural characteristics of borates formed during the interaction of lanthanum and scandium oxides with a potassium tetraborate melt

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Evolution of the spectral characteristics upon annealing of lithium borate glasses containing europium and aluminum

Cited by 11 publications

References 16 publications

Evolution of Spectral and Structural Characteristics of Orthoborates Lu0.99 – xGdxEu0.01BO3

Evolution of Spectral and Structural Characteristics of Orthoborates Lu0.99 – xGdxEu0.01BO3

Stacking Sequences of Coherent EuAl3(BO3)4 Polymorphs Define Local Eu3+ Symmetry and Control Access to Quantum Information Storage

Evolution of the spectral and structural characteristics of borates formed during the interaction of lanthanum and scandium oxides with a potassium tetraborate melt

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Stacking Sequences of Coherent EuAl₃(BO₃)₄ Polymorphs Define Local Eu³⁺ Symmetry and Control Access to Quantum Information Storage