Repo Dosen ULM

Photoluminescence and ESR identification of γ-ray irradiation induced defects responsible for thermoluminescence in Tb3+ activated hibonite (CaAl12O19) powder material.

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dc.contributor.author Singh, Vijay
dc.contributor.author Watanabe, S.
dc.contributor.author Rao, T. K. Gundu
dc.contributor.author Singh, N.
dc.contributor.author Srivastava, Anoop K.
dc.contributor.author Singh, Pramod K.
dc.contributor.author Gao, H.
dc.contributor.author Mardina, Primata
dc.contributor.author Dhoble, S. J.
dc.date.accessioned 2022-07-28T01:02:14Z
dc.date.available 2022-07-28T01:02:14Z
dc.date.issued 2016-05
dc.identifier.issn 1573-8663
dc.identifier.uri https://repo-dosen.ulm.ac.id//handle/123456789/24905
dc.description.abstract CaAl12O19 powder activated with Tb ions has been prepared by the urea combustion route. Phase evolution of the powder is determined by X-ray diffraction techniques. Photoluminescence emission of CaAl12O19:Tb consists of a dominant peak at 544 nm when excited with UV radiations. Thermoluminescence (TL) peaks at approximately 140 °C, 245 °C and 458 °C are observed in the CaAl12O19:Tb phos phor. Investigations using the technique of electron spin reso nance (ESR) were carried out to study the defect centers in duced in the phosphor by γ-ray irradiation. ESR study reveals the presence of several distinct centers. One of the centers (center I) with an isotropic g factor 2.0110 is tentatively assigned to an intrinsic O− type center and this center relates with the TL peak at 140 °C. Center II with an axially symmet ric g-tensor with principal values g∥ = 2.0324 and g⊥ = 2.0060 is attributable to an O2 − ion and also appears to correlate with the 140 °C TL peak. Several F+ -centers have been identified and their correlation with the observed TL peaks will be discussed. en_US
dc.language.iso en en_US
dc.publisher Springer en_US
dc.subject Tb3+ en_US
dc.subject Hibonite en_US
dc.subject Defect centers en_US
dc.subject Luminescence en_US
dc.subject electron spin resonance en_US
dc.title Photoluminescence and ESR identification of γ-ray irradiation induced defects responsible for thermoluminescence in Tb3+ activated hibonite (CaAl12O19) powder material. en_US
dc.type Article en_US


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