Preparation of CaB4O7 nanoparticles doped with different concentrations of Tb3+: Photoluminescence and thermoluminescence/optically stimulated luminescence study

Hemam, Ritesh; Singh, L. Robindro; Singh, S. Dorendrajit; Sharan, R.N.

doi:10.1016/j.jlumin.2018.01.062

Cited by 18 publications

(4 citation statements)

References 29 publications

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“…However, when selecting a pure green or blue standard, i.e. a color with a narrow emission band, any main band satellites induce high uncertainties, particularly as the intensity ratio of the doublet bands varies with material and even within a single material, which prepared in a different synthesis conditions [1][2][3][4][5][6],…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Кроме того, довольно часто в спектре FL материалов основные полосы эмиссии ∼ 490 и ∼ 550 nm представлены дуб-летами, природа которых строго не доказана. Однако при необходимости выбора эталона чистого зеленого или синего цвета, то есть цвета с узкой эмиссионной полосой, наличие сателлитов основной полосы вносит большие неопределенности, тем более, что соотношение интенсивностей полос дублета изменяется от материала к материалу и даже для одного материала, но приготовленного в несколько отличающихся условиях синтеза [1][2][3][4][5][6], а также от длины волны возбуждения FL [7]. Это связано, в том числе, с чувствительностью ионов Tb 3+ к ближайшему окружению [8], особенно к содержанию избыточного кислорода в соединениях TbO 1.5+x [2] и с эффективностью передачи возбуждения FL с окружения на ион активатор.…”

Section: Introductionunclassified

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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“…Other borate matrices, such as SrB4O7, BaB4O7, and CaB4O7, have also been explored for use as luminescent dosimeters [26][27][28][29][30]. Pure SrB4O7 has a TL efficiency similar to the commercial dosimeter TLD-700 ( 7 LiF:Mg,Ti) [31].…”

Section: Introductionmentioning

confidence: 99%

“…BaB4O7 doped with Ce has a TL sensitivity approximately 1.8 times higher than that of TLD-100 (LiF:Mg,Ti) and a linear response over a dose range of 1.5 mGy to 1.3 kGy, with a fading of 5% after 30 days [27]. CaB4O7, although having a high Zeff of 12.5, shows a sensitivity 8 times higher than that of TLD-100 when doped with Dy [28,29,32,33].…”

Section: Introductionmentioning

confidence: 99%

Challenges in personal and clinical dosimetry using Li2B4O7 and MgB4O7 as TLD and OSLD

Oliveira¹,

Souza²,

Donald³

et al. 2022

Braz. J. Rad. Sci.

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Thermoluminescent (TLD) and optically stimulated luminescent dosimeters (OSLD) are essential in radiation dosimetry. Such dosimeters can be easily transported due to their small size and can be used in in vivo dosimetry and anthropomorphic simulations. In this work, the dosimetric properties of Li2B4O7 and MgB4O7 compounds were evaluated based on their response to the applied stimulus, whether thermal or optical. The linear dose response range of the luminescent signal, its fading, the lowest detectable dose, and reproducibility are important parameters in determining a good dosimeter for clinical and personal dosimetry. Therefore, the objective of this work was, based on studies performed by other authors on dosimetric characterizations of doped a codoped Li2B4O7 and MgB4O7, to point out those compounds with the greatest potential for applications in personal and clinical dosimetry using TL and OSL techniques. Considering the results described in other works, the materials that stood out for use in personal and clinical dosimetry were Li2B4O7:Cu and MgB4O7:Dy,Na. In several of the reported studies, no data related to LDD, fading and reproducibility of the luminescent signal of the investigated compounds were found. Therefore, there are many possibilities for investigations into these two types of compounds for the purpose of their use in personal and clinical dosimetry. Further studies will provide a broader scientific basis for choosing appropriate dosimetric materials for these applications.

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Preparation of CaB4O7 nanoparticles doped with different concentrations of Tb3+: Photoluminescence and thermoluminescence/optically stimulated luminescence study

Cited by 18 publications

References 29 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%)

Challenges in personal and clinical dosimetry using Li2B4O7 and MgB4O7 as TLD and OSLD

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