Thermoluminescence and electron paramagnetic resonance correlation studies in lithium silicate phosphor

Sandra C. Aynaya-Cahui; Nilo F. Cano; Alejandro H. Lopez-Gonzales; T. K. Gundu Rao; Monise B. Gomes; Rene R. Rocca; Jose F.D. Chubaci; Shigueo Watanabe; Jorge S. Ayala-Arenas

doi:10.1016/j.solidstatesciences.2021.106777

Thermoluminescence and electron paramagnetic resonance correlation studies in lithium silicate phosphor

Sandra C. Aynaya-Cahui, Nilo F. Cano, Alejandro H. Lopez-Gonzales, T. K. Gundu Rao, Monise B. Gomes, Rene R. Rocca, Jose F.D. Chubaci, Shigueo Watanabe, Jorge S. Ayala-Arenas

Departamento Académico de Física

Research output: Contribution to journal › Article › peer-review

Abstract

Lithium silicate phosphor, synthesized by the solid-state reaction method, displays three thermoluminescence (TL) peaks at 155 °C, 240 °C and 430 °C. Activation energy, frequency factor and kinetic order associated with the TL peaks have been determined using E-T_STOP and glow curve deconvolution (GCD) methods. Electron Paramagnetic Resonance (EPR) studies have been carried out to identify the defect centers induced in the phosphor by gamma irradiation and also to find the centers responsible for the TL process in the system. The observed EPR spectrum arises from a superposition of three defect centers. One of the centers (center I) with a g-value 2.0097 is identified as the O⁻ ion. Center II with an isotropic g-value 2.0002 is assigned to a F⁺-type center (singly ionized oxygen vacancy). The F⁺ center is likely to be associated with the TL peak at 156 °C. Center III characterized by a rhombic g-tensor with g₁ = 1.9831, g₂ = 1.9676, and g₃ = 1.9208 is identified as a Ti³⁺ center. The Ti³⁺ center relates to the low temperature TL peak at 155 °C.

Original language	English
Article number	106777
Journal	Solid State Sciences
Volume	123
DOIs	https://doi.org/10.1016/j.solidstatesciences.2021.106777
State	Published - Jan 2022

Bibliographical note

Funding Information:
The authors would like to express thanks to Ms. E. Somessari from the Institute for Energy and Nuclear Researches (IPEN), Brazil, for kindly carrying out the ? irradiation of the samples. This work was supported by CONCYTEC-FONDECYT, Peru, in the framework of the call E038-01 (Process number 037?2019).

Funding Information:
The authors would like to express thanks to Ms. E. Somessari from the Institute for Energy and Nuclear Researches (IPEN), Brazil, for kindly carrying out the γ irradiation of the samples. This work was supported by CONCYTEC-FONDECYT , Peru, in the framework of the call E038-01 (Process number 037–2019 ).

Publisher Copyright:
© 2021 Elsevier Masson SAS

Keywords

Defect centers
EPR
Lithium silicate
TL

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10.1016/j.solidstatesciences.2021.106777

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Aynaya-Cahui, S. C., Cano, N. F., Lopez-Gonzales, A. H., Gundu Rao, T. K., Gomes, M. B., Rocca, R. R., Chubaci, J. F. D., Watanabe, S., & Ayala-Arenas, J. S. (2022). Thermoluminescence and electron paramagnetic resonance correlation studies in lithium silicate phosphor. Solid State Sciences, 123, Article 106777. https://doi.org/10.1016/j.solidstatesciences.2021.106777

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abstract = "Lithium silicate phosphor, synthesized by the solid-state reaction method, displays three thermoluminescence (TL) peaks at 155 °C, 240 °C and 430 °C. Activation energy, frequency factor and kinetic order associated with the TL peaks have been determined using E-TSTOP and glow curve deconvolution (GCD) methods. Electron Paramagnetic Resonance (EPR) studies have been carried out to identify the defect centers induced in the phosphor by gamma irradiation and also to find the centers responsible for the TL process in the system. The observed EPR spectrum arises from a superposition of three defect centers. One of the centers (center I) with a g-value 2.0097 is identified as the O− ion. Center II with an isotropic g-value 2.0002 is assigned to a F+-type center (singly ionized oxygen vacancy). The F+ center is likely to be associated with the TL peak at 156 °C. Center III characterized by a rhombic g-tensor with g1 = 1.9831, g2 = 1.9676, and g3 = 1.9208 is identified as a Ti3+ center. The Ti3+ center relates to the low temperature TL peak at 155 °C.",

keywords = "Defect centers, EPR, Lithium silicate, TL",

author = "Aynaya-Cahui, {Sandra C.} and Cano, {Nilo F.} and Lopez-Gonzales, {Alejandro H.} and {Gundu Rao}, {T. K.} and Gomes, {Monise B.} and Rocca, {Rene R.} and Chubaci, {Jose F.D.} and Shigueo Watanabe and Ayala-Arenas, {Jorge S.}",

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doi = "10.1016/j.solidstatesciences.2021.106777",

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AU - Aynaya-Cahui, Sandra C.

AU - Cano, Nilo F.

AU - Lopez-Gonzales, Alejandro H.

AU - Gundu Rao, T. K.

AU - Gomes, Monise B.

AU - Rocca, Rene R.

AU - Chubaci, Jose F.D.

AU - Watanabe, Shigueo

AU - Ayala-Arenas, Jorge S.

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N2 - Lithium silicate phosphor, synthesized by the solid-state reaction method, displays three thermoluminescence (TL) peaks at 155 °C, 240 °C and 430 °C. Activation energy, frequency factor and kinetic order associated with the TL peaks have been determined using E-TSTOP and glow curve deconvolution (GCD) methods. Electron Paramagnetic Resonance (EPR) studies have been carried out to identify the defect centers induced in the phosphor by gamma irradiation and also to find the centers responsible for the TL process in the system. The observed EPR spectrum arises from a superposition of three defect centers. One of the centers (center I) with a g-value 2.0097 is identified as the O− ion. Center II with an isotropic g-value 2.0002 is assigned to a F+-type center (singly ionized oxygen vacancy). The F+ center is likely to be associated with the TL peak at 156 °C. Center III characterized by a rhombic g-tensor with g1 = 1.9831, g2 = 1.9676, and g3 = 1.9208 is identified as a Ti3+ center. The Ti3+ center relates to the low temperature TL peak at 155 °C.

AB - Lithium silicate phosphor, synthesized by the solid-state reaction method, displays three thermoluminescence (TL) peaks at 155 °C, 240 °C and 430 °C. Activation energy, frequency factor and kinetic order associated with the TL peaks have been determined using E-TSTOP and glow curve deconvolution (GCD) methods. Electron Paramagnetic Resonance (EPR) studies have been carried out to identify the defect centers induced in the phosphor by gamma irradiation and also to find the centers responsible for the TL process in the system. The observed EPR spectrum arises from a superposition of three defect centers. One of the centers (center I) with a g-value 2.0097 is identified as the O− ion. Center II with an isotropic g-value 2.0002 is assigned to a F+-type center (singly ionized oxygen vacancy). The F+ center is likely to be associated with the TL peak at 156 °C. Center III characterized by a rhombic g-tensor with g1 = 1.9831, g2 = 1.9676, and g3 = 1.9208 is identified as a Ti3+ center. The Ti3+ center relates to the low temperature TL peak at 155 °C.

KW - Defect centers

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KW - Lithium silicate

KW - TL

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Thermoluminescence and electron paramagnetic resonance correlation studies in lithium silicate phosphor

Abstract

Bibliographical note

Keywords

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