The creation spectra of intrinsic emission of a <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>L</mml:mi><mml:mi>i</mml:mi><mml:mi>K</mml:mi><mml:mi>S</mml:mi><mml:mi>O</mml:mi></mml:mrow><mml:mn>4</mml:mn></mml:msub></mml:math> crystal irradiated by ultraviolet photons

Nurakhmetov, Т.N.; Salikhodzha, Zh.M.; Bakhtizin, R. Z.; Zhunusbekov, A.M.; Kainarbay, A.Zh.; Sadykova, B.M.; Zhangylyssov, K.B.; Yussupbekova, B.N.

doi:10.1016/j.ijleo.2019.03.082

Cited by 11 publications

(6 citation statements)

References 12 publications

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“…Usually, PL emission is attributed to three different physical bases: self-trapped excitons, vacancies, and surface states (defect). [48][49][50] In addition, when we further excited our Eu 3+ doped crystal by 393 nm wavelength photons, the same emission peaks with the comparatively small intensity we observed. It seems the quantum yield enhances when excited the sample with higher energy photon (more or exactly its CTB).…”

Section: Photoluminescencesupporting

confidence: 77%

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu³⁺ and Tb³⁺ Ion Doping

Najar

Naik

Farooq

et al. 2020

Crystal Research and Technology

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A slow evaporation solution growth technique is used to grow rare earth (Eu3+ and Tb3+) doped lithium sulfate monohydrate (LSMH) single crystals. X‐ray diffraction analysis of these crystals confirms the monoclinic crystal structure with P21 space group. Energy dispersive X‐ray spectroscopy is used to check the incorporation of dopants into the crystal lattice of these LSMH crystals. Dielectric, UV–vis photoluminescence spectroscopy studies are carried out to study the electrical and optical behavior of these crystals. The optical bandgap decreases by doping and the current material follows the direct allowed transition. The dielectric constant and ac conductivity slightly increase with the incorporation of Eu3+ and Tb3+ ions in the crystal matrix. The effect of doping on the functional groups of LSMH crystals is confirmed by Fourier transform infrared spectroscopy. The micro‐Raman spectroscopic technique is carried out on these samples, confirming the stress experienced by the crystal with dopants, and further leading to the degradation of the crystal structure. The photoluminescence emission with a large decay time of the as‐grown crystals is dominated by the 5D0 → 7Fj transitions of Eu3+ and 5D4 → 7Fj transitions of Tb3+ ions, and further provides a possibility of using them as potential optical materials.

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Section: Photoluminescencesupporting

confidence: 77%

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu³⁺ and Tb³⁺ Ion Doping

Najar

Naik

Farooq

et al. 2020

Crystal Research and Technology

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“…The main intrinsic emission at 3.7-3.8 eV appears upon excitation by lowenergy photons with energies 5.1-6.2 eV and high-energy photons with energies of 6.9-10.5 eV. It was assumed that the appearance of emission 3.7-3.8 eV is associated with the recombination of electrons in the s state of the conduction band with localized holes relaxed from the first, second and third subbands in the 2p state of oxygen above the top of the valence band [8].…”

Section: Introductionmentioning

confidence: 99%

Mechanisms formation of electron-hole trap centers in LiKSO4 crystall

Nurakhmetov

Salikhodzha

Zhunusbekov

et al. 2021

Eurasian J. Phys. Funct. Mater.

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The mechanisms of creation of electron-hole trapping centers in LiKSO4 have been investigated by the methods of vacuum and thermal activation spectroscopy. It is shown that electron-hole trapping centers are formed during the trapping of electrons by anionic complexes and localization of a hole in the lattice in the form of the radical SO4−. The appearance of phosphorescence at 3.0-3.1 eV, 2.6-2.7 eV and 2.3-2.4 eV confirms the creation of electron-hole trap centers.

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“…Only a few studies have been carried out showing the luminescence properties of SrSO 4 by doping it with rare-earth elements. [13,14,21,22] Similarly, few reports are available in the literature on intrinsic recombination luminescence in various alkali metal sulphates [23][24][25][26][27] and calcium sulphate [28,29] providing results on defect-based luminescence having a Stokes shift. Recently, Bao-gai Zhai et al have also shown intrinsic PL and cyan-coloured afterglow in undoped SrSO 4 nanoplates on UV excitation due to the presence of defects, mainly due to oxygen vacancies.…”

mentioning

confidence: 99%

Infrared‐to‐visible conversion in strontium sulphate through a defect‐based infrared stimulated visible emission phenomenon

et al. 2023

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Strontium sulphate (SrSO4) is a defect‐based photoluminescence material, generally used in thermoluminescence applications, and has been studied for infrared (IR) stimulated visible emission. The SrSO4 particles were synthesized using a precipitation method. The orthorhombic phase of SrSO4 was confirmed from the X‐ray diffraction pattern and the formation of micron‐sized particles was authenticated from field emission scanning electron micrographs. The elemental composition of oxygen and strontium was determined using energy‐dispersive X‐ray analysis measurement that confirmed the presence of VO•• and VSr′′ intrinsic defects in the material. Photoluminescence investigations showed the presence of various defect bands in the band gap giving rise to intrinsic luminescence in SrSO4. The emission in the visible region was attributed to the defect band arising due to 0.25emVO••. Photoluminescence lifetime measurement confirmed the presence of stable defect states with a lifetime in microseconds. The SrSO4 sample was tested using IR lasers and a red–orange emission spot was observed from the powder sample when excited with IR lasers. The underlying principle for IR‐to‐visible conversion in the material is a defect‐mediated phenomenon that has been described through the energy level diagram of the material.

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The creation spectra of intrinsic emission of a LiKSO4 crystal irradiated by ultraviolet photons

Cited by 11 publications

References 12 publications

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu³⁺ and Tb³⁺ Ion Doping

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu³⁺ and Tb³⁺ Ion Doping

Mechanisms formation of electron-hole trap centers in LiKSO4 crystall

Infrared‐to‐visible conversion in strontium sulphate through a defect‐based infrared stimulated visible emission phenomenon

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The creation spectra of intrinsic emission of a LiKSO4 crystal irradiated by ultraviolet photons

Cited by 11 publications

References 12 publications

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu3+ and Tb3+ Ion Doping

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu3+ and Tb3+ Ion Doping

Mechanisms formation of electron-hole trap centers in LiKSO4 crystall

Infrared‐to‐visible conversion in strontium sulphate through a defect‐based infrared stimulated visible emission phenomenon

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Product

Resources

About

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu³⁺ and Tb³⁺ Ion Doping

Growth and Various Characterizations of Lithium Sulfate Monohydrate Single Crystals after Eu³⁺ and Tb³⁺ Ion Doping