Influence of Indium on the Spectral and Structural Characteristics of Lu0.98 – xInxEu0.02BO3

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

doi:10.1134/s1063783420120252

Cited by 5 publications

(12 citation statements)

References 22 publications

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“…It is shown that in compounds doped with europium and terbium, intense luminescence of Eu 3+ ions is observed, while the luminescence intensity of Tb 3+ ions is extremely low. This is due, as the authors of [6] believe, to the transfer of energy from Tb 3+ ions to Eu 3+ .…”

Section: Introductionmentioning

confidence: 97%

“…For example, the band gap (E g ) of LuBO 3 samples having the structure of vaterite and calcite is 7.0 and 6.4 eV, respectively [1,2]. The different spectral composition of photoluminescence of the vaterite and calcite modifications of LuBO 3 (Eu) causes the red and orange luminescence characteristic of these structures, respectively [3][4][5][6][7]. Significant differences are also observed in the luminescence excitation spectra (LES) of various structural modifications of these compounds [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…The different spectral composition of photoluminescence of the vaterite and calcite modifications of LuBO 3 (Eu) causes the red and orange luminescence characteristic of these structures, respectively [3][4][5][6][7]. Significant differences are also observed in the luminescence excitation spectra (LES) of various structural modifications of these compounds [4][5][6][7]. The LES of the most intense luminescence bands LuBO 3 (Eu) contain a charge transfer band (CTB) with a maximum at ∼ 238 nm for the vaterite structure and at ∼ 250 nmfor calcite, as well as resonant bands of Eu 3+ ions, the most intense of which is the band with λ ex ∼ 394 nm.…”

Section: Introductionmentioning

confidence: 99%

“…In orthoborates InBO 3 (Eu) having a calcite structure, CTB is also more than 30 times more intense than the band 394 nm. The presence of a dominant charge transfer band in the LES is an important characteristic of the calcite modification of compounds ReBO 3 , where Re = Lu, In [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

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Structural and spectral characteristics of La-=SUB=-0.99-x-=/SUB=-Tb-=SUB=-x-=/SUB=-Eu-=SUB=-0.01-=/SUB=-BO-=SUB=-3-=/SUB=- orthoborates and energy transfer from Tb-=SUP=-3+-=/SUP=- to Eu-=SUP=-3+-=/SUP=-

Шмурак

V.V.

A.P.

et al. 2022

Physics of the Solid State

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The structure, infrared (IR) absorption spectra, luminescence spectra (SL), and luminescence excitation spectra (LES) of La0.99-xTbxEu0.01BO3 orthoborates synthesized at 970oC at 0≤ x≤ 0.99 were studied. An increase in x leads to the successive emergence of three structural states of these compounds. At 0≤ x≤0.2, orthoborates have an aragonite structure; then, at 0.2<x <0.89, they become two-phase and contain the aragonite and vaterite phases. At 0.89≤ x≤ 0.99, the compounds have a vaterite structure. A correspondence between the structure and spectral characteristics of these compounds was established. It is shown that in La0.99-xTbxEu0.01BO3 orthoborates, as well as in La0.99-xYxEu0.01BO3, the band with λex=369 nm (7F0->5D2) in the LES and the band in the wavelength range of 577-582 nm (5D0->7F0) in the SL of these compounds can serve as indicators of the structural state of the sample. In the SL of the samples containing the aragonite and vaterite phases, two bands corresponding to these structures were simultaneously observed for the first time. It was established that the luminescence of Eu3+ ions in La0.99-xTbxEu0.01BO3 orthoborates, which occurs when the sample is excited by light in the absorption bands of Tb3+ ions, is due to the transfer of the electron excitation energy from Tb3+ ions to Eu3+ ions. The efficiency of this process in La0.9Tb0.09Eu0.01BO3 samples with an aragonite structure is 86%. Keywords: rare earth orthoborates, crystal structure, X-ray diffraction analysis, IR spectroscopy, luminescence spectra, phosphors for LEDs.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural and spectral characteristics of La-=SUB=-0.99-x-=/SUB=-Tb-=SUB=-x-=/SUB=-Eu-=SUB=-0.01-=/SUB=-BO-=SUB=-3-=/SUB=- orthoborates and energy transfer from Tb-=SUP=-3+-=/SUP=- to Eu-=SUP=-3+-=/SUP=-

Шмурак

V.V.

A.P.

et al. 2022

Physics of the Solid State

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“…Orthoborates of REBO 3 (RE = Eu, Gd, Tb, Dy, Y) and InBO 3 have different, but only one structural modification: vaterite for the mentioned orthoborates of rare earth elements and calcite for indium orthoborate [16][17][18][19][20][21]. Solid solution of Lu 1−x In x BO 3 , synthesized at 780 • C (LuBO 3 vaterite presence temperature), is crystallized in calcite structure at x > 0.08−0.1 [22]. At the same time, solid solutions of Lu 1−x RE x BO 3 (RE = Eu, Gd, Tb, Dy and Y) at x > 0.15−0.2, synthesized at T = 970−1100 • C (LuBO 3 calcite phase presence temperature), are crystallized at vaterite structure [12,13].…”

Section: Introductionmentioning

confidence: 99%

The evolution of the spectral and structural characteristics of La-=SUB=-0.98-x-=/SUB=-Lu-=SUB=-x-=/SUB=-Eu-=SUB=-0.02-=/SUB=-BO-=SUB=-3-=/SUB=- orthoborates

Кедров

et al. 2022

Physics of the Solid State

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The structure, IR absorption, luminescence, and luminescence excitation spectra of La0.98-xLuxEu0.02BO3 orthoborates synthesized at 970oC were studied at 0≤ x≤0.98. An increase in x leads to a sequential change of the structural state of the orthoborates. At first, the compound has the aragonite structure. Then, it becomes two-phase and contains the aragonite and vaterite phases. With a further increase in x, the compounds have the vaterite structure, then the vaterite and calcite structure, and, finally, the calcite structure. Correspondence between the structure and spectral characteristics of these compounds was established. Luminescence spectra were investigated at different wavelengths of exciting light. This allowed obtaining information on the structure of a near-surface layer and the bulk of microcrystals of the investigated samples. It is shown that the vaterite phase arises in the bulk of microcrystals of samples that have the aragonite structure. Keywords: phosphors for LEDs, rare earth orthoborates, X-ray diffraction analysis, IR spectroscopy, luminescence spectra.

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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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Influence of Indium on the Spectral and Structural Characteristics of Lu0.98 – xInxEu0.02BO3

Cited by 5 publications

References 22 publications

Structural and spectral characteristics of La-=SUB=-0.99-x-=/SUB=-Tb-=SUB=-x-=/SUB=-Eu-=SUB=-0.01-=/SUB=-BO-=SUB=-3-=/SUB=- orthoborates and energy transfer from Tb-=SUP=-3+-=/SUP=- to Eu-=SUP=-3+-=/SUP=-

Structural and spectral characteristics of La-=SUB=-0.99-x-=/SUB=-Tb-=SUB=-x-=/SUB=-Eu-=SUB=-0.01-=/SUB=-BO-=SUB=-3-=/SUB=- orthoborates and energy transfer from Tb-=SUP=-3+-=/SUP=- to Eu-=SUP=-3+-=/SUP=-

The evolution of the spectral and structural characteristics of La-=SUB=-0.98-x-=/SUB=-Lu-=SUB=-x-=/SUB=-Eu-=SUB=-0.02-=/SUB=-BO-=SUB=-3-=/SUB=- orthoborates

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

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