Synthesis and luminescence properties of RE3+ (RE = Yb, Er, Tm, Eu, Tb)-doped Sc2O3 microcrystals

Li, Daguang; Qin, Weiping; Liu, Shihu; Pei, Wenbo; Wang, Zhe; Zhang, Peng; Wang, Lili; Huang, Ling

doi:10.1016/j.jallcom.2015.09.061

Cited by 23 publications

(4 citation statements)

References 41 publications

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“…According to the DRS experiments, all polycrystalline samples have high ultraviolet optical absorption about 70−80%. The excitation wavelength of λ ex = 265 nm was selected according to the excitation energy transfer via the known channels: charge transfer Gd 3+ → Tb 3+ charges and electron transfer 4 f → 5d Tb 3+ [5,12].…”

Section: Methodsmentioning

confidence: 99%

Peculiarities of changes in the intensities of the main photoluminescence bands of Tb-=SUP=-3+-=/SUP=- ions and their satellites in polycrystalline Gd-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- : Tb(3 mol%)

Bakovets V. V.,

Plyusnin P. E.,

Jushina I. V.

et al. 2023

Physics of the Solid State

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Samples of Gd2O3 : Tb(3 mol%) phosphor were obtained by sol-gel method followed by annealing at 800oC and 1200oC in air. At high annealing temperature, the intensities of the main emission bands 484 and 541 nm increase, but the ratio of the intensities of these emission bands to their satellites 493 and 549 nm respectively decreases. Based on the analysis of X-ray diffractometry, emission spectra, far-infrared and Raman spectroscopy, as well as diffuse reflectance spectroscopy, we established: the increase in the crystallinity of the samples with a significant reduction of the lattice strain stress at elevated annealing temperatures, changes in the structure of the bandgap with degenerated acceptor and donor zones of impurities Tb4+ and Tb3+ respectively. The diffuse reflection spectra of the sample after annealing at 800oC under optical excitation showed a direct charge transition through the bandgap with Eg=2.56 eV. After elevated annealing temperature the concentration of Tb4+ ions decreases due to reduction to Tb3+. As a result, at low excitation energies the degeneracy of the acceptor zone is still preserved and there is a direct transition of charges through the bandgap with Eg=2.55 eV. At high excitation energies the degeneracy of the acceptor zone is removed and there is a direct transition through the bandgap with Eg=3.39 eV. These effects are accompanied by a relatively large increase in the emission intensity of the satellites, especially at the 549 nm. Keywords: Gd oxide, Tb3++ photoluminescence spectra, far infrared and Raman spectroscopy spectra, structure of the bandgape, distribution of Tb3+ and Tb4+ in cation sublattice.

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Section: Methodsmentioning

confidence: 99%

Peculiarities of changes in the intensities of the main photoluminescence bands of Tb-=SUP=-3+-=/SUP=- ions and their satellites in polycrystalline Gd-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- : Tb(3 mol%)

Bakovets V. V.,

Plyusnin P. E.,

Jushina I. V.

et al. 2023

Physics of the Solid State

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“…Согласно экспериментам по DRS все поликристаллические образцы имеют большое оптическое поглощение порядка 70−80% в ультрафиолетовой области. Длина волны возбуждения λ ex = 265 nm была выбрана исходя из передачи энергии возбуждения по известным каналам: передачей зарядов Gd 3+ → Tb 3+ и переносом электронов 4 f → 5d Tb 3+ [5,12].…”

Section: экспериментальная частьunclassified

Особенности изменения интенсивностей основных полос фотолюминесценции ионов Tb-=SUP=-3+-=/SUP=- и их сателлитов в поликристаллическом люминофоре Gd-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=-:Tb(3 mol%)

Баковец¹,

Плюснин²,

Юшина³

et al. 2023

Физика Твердого Тела

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Samples of Gd2O3:Tb(3 mol%) phosphor were obtained by sol-gel method followed by annealing at 800oC and 1200oC in air. At high annealing temperature, the intensities of the main emission bands 484 and 541 nm increase, but the ratio of the intensities of these emission bands to their satellites 493 and 549 nm respectively decreases. Based on the analysis of X-ray diffractometry, radiation spectra, far-infrared and Raman spectroscopy, as well as diffuse reflectance spectroscopy, we established: the increase in the crystallinity of the samples with a significant reduction of the lattice strain stress at elevated annealing temperatures, changes in the structure of the bandgap with degenerated acceptor and donor zones of impurities Tb4+ and Tb3+ respectively. The diffuse reflection spectra of the sample after annealing at 800oC under optical excitation showed a direct charge transition through the bandgap with Eg = 2.56 eV. After elevated annealing temperature the concentration of Tb4+ ions decreases due to reduction to Tb3+. As a result, at low excitation energies the degeneracy of the acceptor zone is still preserved and there is a direct transition of charges through the bandgap with Eg = 2.55 eV. At high excitation energies the degeneracy of the acceptor zone is removed and there is a direct transition through the bandgap with Eg = 3.39 eV. These effects are accompanied by a relatively large increase in the emission intensity of the satellites, especially at the 549 nm.

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“…Концентрации Tb 3+ и Eu 3+ 1 и 2.5 mol% выбраны, так как при концентрациях < 1.5 mol% ионы Tb 3+ и Eu 3+ получают возбуждение ФЛ независимо, а при концентрациях > 1.5 mol% ионы Tb 3+ передают частично энергию возбуждения с уровня 5 D 4 на уровень 5 D 1 катионов Eu 3+ как соактиваторы ФЛ, например, в матрице CaWO 4 [19]. Наиболее эффективной была признана концентрация Eu 3+ 2.5 mol% в работах [20,21] [10,26] для эффективной эмиссии ионов Tb 3+ и Eu 3+ по соответствующим излучательным переходам. Для моноклинной модификации пропускание на длине волны λ = 280 nm было почти в 2 раза ниже, эффективность возбуждения на полосе 612 nm такая же, как и для кубической модификации, а на полосе 550 nm в 8 раз выше.…”

Section: экспериментальная частьunclassified

Фазовые превращения и особенности фотолюминесценции твердых растворов Gd-=SUB=-2(1-x)-=/SUB=-Tb-=SUB=-x-=/SUB=-Eu-=SUB=-x-=/SUB=-O-=SUB=-3-=/SUB=-

Баковец¹,

Dolgovesova²,

Pivovarova³

et al. 2020

Физика Твердого Тела

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Solid solutions Gd2(1-x)TbxEuxO3, where x = 1 and 2.5 mol%, were obtained in an atmosphere of air and hydrogen by the sol-gel method followed by annealing at 700-1200 °C. It was found by XRD and IR spectroscopy that, during annealing, the solutions undergo chemical and phase transformations of the cubic modification into the monoclinic one and change the degree of crystallinity. Under some annealing conditions, the solid solution contains microinclusions of the Tb7O12:Eu3+ phase, which is not formed in a hydrogen atmosphere or at a high activator concentration of 2.5 mol% at 1200 oC. In accordance with these transformations, a redistribution of the photoluminescence activators Tb3+ and Eu3+ occurs over the centrosymmetric C3i, noncentrosymmetric C2 positions of the crystal lattice, and the surface states of Cs. As a result of these rearrangements, the parameters of the photoluminescence spectra change, which are associated with a change in the ways of transferring the excitation energy of the main radiative transitions of the photoluminescence activators Tb3+ and Eu3+.

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Synthesis and luminescence properties of RE3+ (RE = Yb, Er, Tm, Eu, Tb)-doped Sc2O3 microcrystals

Cited by 23 publications

References 41 publications

Peculiarities of changes in the intensities of the main photoluminescence bands of Tb-=SUP=-3+-=/SUP=- ions and their satellites in polycrystalline Gd-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- : Tb(3 mol%)

Peculiarities of changes in the intensities of the main photoluminescence bands of Tb-=SUP=-3+-=/SUP=- ions and their satellites in polycrystalline Gd-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- : Tb(3 mol%)

Фазовые превращения и особенности фотолюминесценции твердых растворов Gd-=SUB=-2(1-x)-=/SUB=-Tb-=SUB=-x-=/SUB=-Eu-=SUB=-x-=/SUB=-O-=SUB=-3-=/SUB=-

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