A template-free solvothermal synthesis and photoluminescence properties of multicolor Gd 2 O 2 S: x Tb 3+ , y Eu 3+ hollow spheres

Sang, Xiaotong; Xu, Guangxi; Lian, Jingbao; Wu, Naiqin; Zhang, Xue; He, Jiao

doi:10.1016/j.solidstatesciences.2018.03.024

Cited by 10 publications

(12 citation statements)

References 37 publications

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“…4, b). Thus, when the concentration of Tb 3+ ions in the system increases, the known maximum limit of concentration quenching development, previously determined as < 4.5 mol.% [20,19] or 1 mol.% [21], is not present in our case, at the least, up to 7 mol.%, the same as in [22]. It appears that when the GdOF : Tb 3+ impurity (and/or TbOF) is present, channels of radiative transition excitation transfer in Tb 3+ ions change with the participation of lanthanoid oxofluoride levels.…”

Section: Resultssupporting

confidence: 54%

Increasing the intensity of the glow of the phosphor Gd-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-S : Tb(3-7 mol.%), caused by a change in the distribution of the Tb-=SUP=-3+-=/SUP=- activator over the real crystal lattice

V.V.

I.P.

et al. 2022

Physics of the Solid State

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Luminophores Gd2O2S : Tb(3-7 mol.%), obtained through the stage of sol-gel formation of Gd2O3 : Tb precursors with their subsequent sulfidation in sulfur vapor with LiF flux at 700oC, showed high luminescence efficiency. The characterization of the obtained samples by a set of physicochemical methods established that an increase in the concentration of the Tb3+ activator leads to its specific distribution: over gadolinium vacancies (VGd)''', by replacing Gd3+ ions and concentrating it at the boundaries of crystallites. It is noted that in this case, the morphology of crystallites changes, the short-range order of the structural unit of the lattice (Gd2O2) changes with the introduction of S2- ions into oxygen vacancies [VO]oo or the substitution of O2- anions, as a result of which the long-range order of the anionic sublattice is violated and the band gap decreases. At high concentrations of the photoluminescence activator Tb3+ 7 mol.%, radiation quenching does not occur due to the presence of the GdOF and TbOF phases. Variations of these effects with an increase in the Tb3+ concentration lead to an increase in the intensity of the emission in the green region of the 5D4->7Fj transitions and a decrease in the intensity of the emission in the blue region of the 5D3->7Fj transitions. Keywords: phosphor Gd2O2S : Tb(3-7 mol.%), real lattice structure, photoluminescence activator distribution, far infrared spectroscopy, Raman spectroscopy, XPS spectroscopy.

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Section: Resultssupporting

confidence: 54%

Increasing the intensity of the glow of the phosphor Gd-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-S : Tb(3-7 mol.%), caused by a change in the distribution of the Tb-=SUP=-3+-=/SUP=- activator over the real crystal lattice

V.V.

I.P.

et al. 2022

Physics of the Solid State

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“…At the same time, the position of the Gd‐O bond absorption peak has changed a little, which is attributed to the peak migration caused by the role of the aerobic charge transfer in the Gd 2 O 2 S:Eu 3+ sample. The absorption peak of the Gd‐S bond was not observed in the infrared spectrum because of its low vibration frequency (The wavenumber is less than 300 cm −1 ) …”

Section: Resultsmentioning

confidence: 99%

“…The absorption peak of the Gd-S bond was not observed in the infrared spectrum because of its low vibration frequency (The wavenumber is less than 300 cm −1 ). 19 Figure 6A,B show the band-gap energy spectra and UV-vis absorption spectra (inset) of Gd 2 O 2 S (A) and where R is the observed reflectance in UV-vis spectra, K is the absorbance and S is the scattering coefficient. The bandgap energy of the spectra is obtained by setting K/S equal to zero.…”

Section: Structural Analysismentioning

confidence: 99%

“…As we all know, it is very important to choose a suitable synthesis method for sample preparation. So far, researchers have synthesized Gd 2 O 2 S nanophosphors through various synthesis methods, such as hydrothermal method, solvothermal, precipitation, gamma irradiation, the sol‐gel method, the combustion method and so on. Among all developed synthetic methods, the solvothermal method based on a solvent system has attracted more and more attention because of its outstanding advantages, such as lower processing temperature, high yield, simple manipulation, uniform products, low energy consumption, high crystallization and so on .…”

Section: Introductionmentioning

confidence: 99%

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Solvothermal synthesis of columnar Gd₂O₂S:Eu³⁺ and a comparative study with columnar Gd₂O₃:Eu³⁺

Qian

Wang

et al. 2019

J Am Ceram Soc

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Columnar Gd2O2S:Eu3+ nanophosphors have been synthesized through solvothermal reaction and subsequent calcination process. The structure, morphology, and luminescence properties of samples were investigated via X‐ray diffraction (XRD), Fourier transform infra‐red (FT‐IR) spectra, UV‐vis absorption spectra, field emission scanning electron microscope (FE‐SEM), and photoluminescence (PL) spectra. The Judd‐Ofelt (J‐O) parameters of Gd2O2S:Eu3+ nanophosphors with different doping concentration were calculated by emission spectra to understand the symmetry, coordination environment, and luminescence behavior of Eu3+ ions in Gd2O2S matrix. In addition, the luminescence properties of columnar Gd2O2S:Eu3+ and Gd2O3:Eu3+ were compared in detail. The comparison results show that there are subtle differences in luminescence intensity, main peak position, luminescence color, and fluorescence lifetime between them, which are closely related to their different substrate's structure, including the band‐gap energy, crystallinity, and symmetry, etc.

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“…Доставка серы и отток кислорода осуществлялись диффузией компонентов по границам кристаллитов и эстафетным замещением одного вида анионов O 2− другим S 2− . Процесс протекал с реконструкцией дальнего порядка при относительном сохранении ближнего порядка катионов [22] сохранялась структурная единица решетки параллелограмм (Gd 2 O 2 ) с незначительными изменениями длин связей. Существенная перестройка дальнего порядка при этом происходит по анионной подрешетке (сравнение FIR-спектров соединений Gd 2 O 2 S : Tb (рис.…”

Section: обсуждение результатовunclassified

Повышение интенсивности свечения люминофора Gd-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-S : Tb(3-7 mol.%), вызванное изменением распределения активатора Tb-=SUP=-3+-=/SUP=- по реальной кристаллической решетке

Баковец¹,

Соколов²,

Долговесова³

et al. 2022

Физика Твердого Тела

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Люминофоры Gd2O2S : Tb(3-7 mol.%), полученные через стадию золь-гель формирования прекурсоров Gd2O3 : Tb с последующим их сульфидированием в парах серы с плавнем LiF при 700oC, показали высокую эффективность свечения. Характеризацией полученных образцов набором физико-химических методов установлено, что увеличение концентрации активатора Tb3+ приводит к его специфическому распределению: по вакансиям гадолиния (VGd)''', замещением ионов Gd3+ и концентрированием его на границах кристаллитов. Отмечено, что при этом изменяется морфология кристаллитов, изменяется ближний порядок структурной единицы решетки (Gd2O2) c внедрением ионов S2- в вакансии кислорода [VO]oo или замещением анионов O2-, в результате чего нарушается дальний порядок анионной подрешетки и уменьшается ширина запрещенной зоны. При этом, образующиеся примесные фазы GdOF : Tb и TbOF способствуют повышению эффективности фотолюминесценции. Вариации этих эффектов при росте концентрации Tb3+ приводят к росту интенсивности полос излучения зеленой области переходов 5D4->7Fj и снижению интенсивности полос излучения синей области переходов 5D3->7Fj. Ключевые слова: люминофор Gd2O2S : Tb(3-7 mol.%), реальная структура решетки, распределение активатора фотолюминесценции, дальняя инфракрасная спектроскопия, рамановская спектроскопия, РФЭС-спектроскопия.

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A template-free solvothermal synthesis and photoluminescence properties of multicolor Gd 2 O 2 S: x Tb 3+ , y Eu 3+ hollow spheres

Cited by 10 publications

References 37 publications

Increasing the intensity of the glow of the phosphor Gd-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-S : Tb(3-7 mol.%), caused by a change in the distribution of the Tb-=SUP=-3+-=/SUP=- activator over the real crystal lattice

Increasing the intensity of the glow of the phosphor Gd-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-S : Tb(3-7 mol.%), caused by a change in the distribution of the Tb-=SUP=-3+-=/SUP=- activator over the real crystal lattice

Solvothermal synthesis of columnar Gd₂O₂S:Eu³⁺ and a comparative study with columnar Gd₂O₃:Eu³⁺

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A template-free solvothermal synthesis and photoluminescence properties of multicolor Gd 2 O 2 S: x Tb 3+ , y Eu 3+ hollow spheres

Cited by 10 publications

References 37 publications

Increasing the intensity of the glow of the phosphor Gd-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-S : Tb(3-7 mol.%), caused by a change in the distribution of the Tb-=SUP=-3+-=/SUP=- activator over the real crystal lattice

Increasing the intensity of the glow of the phosphor Gd-=SUB=-2-=/SUB=-O-=SUB=-2-=/SUB=-S : Tb(3-7 mol.%), caused by a change in the distribution of the Tb-=SUP=-3+-=/SUP=- activator over the real crystal lattice

Solvothermal synthesis of columnar Gd2O2S:Eu3+ and a comparative study with columnar Gd2O3:Eu3+

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Solvothermal synthesis of columnar Gd₂O₂S:Eu³⁺ and a comparative study with columnar Gd₂O₃:Eu³⁺