Luminescent properties of S 2 ? impurity molecular anions in Rb2SO4 crystals

Govorun, D. N.; Kushnirenko, I. Ya.; Nedel'ko, S. G.; Sakun, V. P.; Smolyar, N. P.

doi:10.1007/bf00662195

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(2 citation statements)

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“…This suggests that the origin of the luminescence from thenardite is due to S 2− centre. The emission and excitation spectra due to the S 2− centre in synthetic Na 2 SO 4 , K 2 SO 4 , and Rb 2 SO 4 were observed by some researchers [26][27][28]. Kushunirenko et al observed luminescence due to S 2− in Na 2 SO 4 at 300, 77, and 4.2 K under 337.1 nm excitation.…”

Section: Excitation and Photoluminescence Studies Of Sodiummentioning

confidence: 87%

“…Kushunirenko et al observed luminescence due to S 2− in Na 2 SO 4 at 300, 77, and 4.2 K under 337.1 nm excitation. The emission band with the most intense peak at ∼600 nm showed a distinct vibronic structure which is evident even at RT [26]. Belyi et al prepared synthetic crystals of Na 2 SO 4 : S and Na 2 SO 4 : S, Ca 2+ by heating a mixture of Na 2 SO 4 , and sulphur and CaCl 2 at 1000 ∘ C for 2 h [28].…”

Section: Excitation and Photoluminescence Studies Of Sodiummentioning

confidence: 99%

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Preparation, Characterization, and Luminescence Properties of Orthorhombic Sodium Sulphate

Vidya

Lakshminarasappa

2013

Physics Research International

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A highly efficient thermoluminescence Na 2 SO 4 phosphor with thenardite polymorphic structure was prepared by simple slow evaporation technique followed by subsequent calcination at 200 ∘ C, 400 ∘ C, and 600 ∘ C for 4 h and the resultant crystals were characterized by various analytical techniques. All the samples exhibited thermodynamically stable thenardite phase and the grain growth was increased for the calcined samples. SEM analysis indicated the fine distribution of twinned orthogonal prism and pyramidal structure without any agglomeration. The electron spin resonance spectroscopy showed the existence of SO 4 − radicals as trap centre. The thermoluminescence behavior suggested the charge carrier recombination dynamics in the thenardite sample followed second-order kinetics. The trapping parameters such as activation energy ( ), order of kinetics ( ), and frequency factor ( ) have been determined using Chen's peak shape method. Further fading of the TL intensity of Na 2 SO 4 showed that thenardite is quite suitable for radiation dosimetry even up to 15 days. The photoluminescence band of Na 2 SO 4 reduced in its intensity after -irradiation, suggesting that defects are unstable and decay rapidly.

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Section: Excitation and Photoluminescence Studies Of Sodiummentioning

confidence: 87%

Section: Excitation and Photoluminescence Studies Of Sodiummentioning

confidence: 99%