Radiation defects in alkali metal sulfates irradiated by ultraviolet photons

Nurakhmetov, Т.N.; Кутербеков, К. А.; Salikhodzha, Zh.M.; Zhunusbekov, A.M.; Kainarbay, A.Zh.; Sadykova, B.M.

doi:10.1016/j.radmeas.2016.01.005

Cited by 9 publications

(2 citation statements)

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“…In addition, it can be seen from Figure 2 that the impurity Cu + is excited at photon energies of 5.9-6.05 eV. In our previous works [9,10], it was shown that in this energy region of 5.9-6.05 eV in crystals K 2 SO 4 , as well as in other sulfates, an intrinsic emission band is excited and radiation defects are created. This fact means that defects and emission bands are created by intrinsic electronic excitations of alkali metal sulfates.…”

Section: Discussionmentioning

confidence: 73%

Electron-hole capture centers in an irradiated K2SO4-Cu crystal

Nurakhmetov

Salikhodzha

Bakhtizin

et al. 2019

Eurasian J. Phys. Funct. Mater.

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The methods of vacuum-ultraviolet and thermal activation spectroscopy were used to measure the excitation spectra of impurity radiation in the fundamental absorption band of K 2 SO 4-Cu crystals at 15 K and 300 K. An energy transfer was detected from the base to Cu + impurities. The band gap of crystals K 2 SO 4 was estimated. In K 2 SO 4-Cu crystals, recombination radiation bands were detected at 2.95 ÷ 3.0 eV corresponding to electron-hole capture centers.

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Section: Discussionmentioning

confidence: 73%

Electron-hole capture centers in an irradiated K2SO4-Cu crystal

Nurakhmetov

Salikhodzha

Bakhtizin

et al. 2019

Eurasian J. Phys. Funct. Mater.

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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.…”

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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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