TL and EPR characteristics of SrAl2O4 phosphor prepared by solid-state reaction method

Edwar A. Canaza-Mamani; Nilo F. Cano; Jessica Mosqueira-Yauri; T. K.Gundu Rao; Sandra C. Aynaya-Cahui; Amador J. Gonsalez-Vasquez; Monise B. Gomes; José F.D. Chubaci; Shigueo Watanabe; Jorge S. Ayala-Arenas

doi:10.1016/j.jlumin.2021.118585

TL and EPR characteristics of SrAl₂O₄ phosphor prepared by solid-state reaction method

Edwar A. Canaza-Mamani, Nilo F. Cano, Jessica Mosqueira-Yauri, T. K.Gundu Rao, Sandra C. Aynaya-Cahui, Amador J. Gonsalez-Vasquez, Monise B. Gomes, José F.D. Chubaci, Shigueo Watanabe, Jorge S. Ayala-Arenas

Departamento Académico de Física

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

Abstract

SrAl₂O₄ phosphor was prepared by solid-state reaction method and characterized using X-ray diffraction (XRD), thermoluminescence (TL) and electron paramagnetic resonance (EPR) spectroscopy. TL glow curve of irradiated phosphor shows three peaks at 135, 260 and 350 °C. The order of kinetics of the three TL peaks is second order with an activation energy of 1.05, 1.60 and 1.93 eV, respectively. EPR studies have been carried out to identify the defect centers induced by gamma irradiation and also to identify the defect centers involved in the TL process in SrAl₂O₄. Two distinct centers contribute to the observed spectrum at room temperature. Center I exhibiting a four-line hyperfine splitting is identified as an O⁻ ion. O⁻ ion is associated with the high temperature TL peaks at 260 and 350 °C. An eight-line spectrum with a g-value of 2.0068 is attributed to a F⁺ center (singly ionized oxygen vacancy). This center relates to the 135 °C TL peak.

Original language	English
Article number	118585
Journal	Journal of Luminescence
DOIs	https://doi.org/10.1016/j.jlumin.2021.118585
State	Accepted/In press - 2021

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 partially supported by CONCYTEC-FONDECYT, Peru, in the framework of the call E038-01 (Process number 037?2019). The authors are indebted to Dr. Anuj Soni, Bhabha Atomic Research Center, Mumbai, India for determining some of the parameters presented in this study.

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 partially supported by CONCYTEC - FONDECYT , Peru, in the framework of the call E038-01 (Process number 037–2019 ). The authors are indebted to Dr. Anuj Soni, Bhabha Atomic Research Center, Mumbai, India for determining some of the parameters presented in this study.

Publisher Copyright:
© 2021 Elsevier B.V.

Keywords

Defect points
EPR
SrAlO phosphor
TL

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10.1016/j.jlumin.2021.118585

Cite this

Canaza-Mamani, E. A., Cano, N. F., Mosqueira-Yauri, J., Rao, T. K. G., Aynaya-Cahui, S. C., Gonsalez-Vasquez, A. J., Gomes, M. B., Chubaci, J. F. D., Watanabe, S., & Ayala-Arenas, J. S. (Accepted/In press). TL and EPR characteristics of SrAl₂O₄ phosphor prepared by solid-state reaction method. Journal of Luminescence, Article 118585. https://doi.org/10.1016/j.jlumin.2021.118585

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title = "TL and EPR characteristics of SrAl2O4 phosphor prepared by solid-state reaction method",

abstract = "SrAl2O4 phosphor was prepared by solid-state reaction method and characterized using X-ray diffraction (XRD), thermoluminescence (TL) and electron paramagnetic resonance (EPR) spectroscopy. TL glow curve of irradiated phosphor shows three peaks at 135, 260 and 350 °C. The order of kinetics of the three TL peaks is second order with an activation energy of 1.05, 1.60 and 1.93 eV, respectively. EPR studies have been carried out to identify the defect centers induced by gamma irradiation and also to identify the defect centers involved in the TL process in SrAl2O4. Two distinct centers contribute to the observed spectrum at room temperature. Center I exhibiting a four-line hyperfine splitting is identified as an O− ion. O− ion is associated with the high temperature TL peaks at 260 and 350 °C. An eight-line spectrum with a g-value of 2.0068 is attributed to a F+ center (singly ionized oxygen vacancy). This center relates to the 135 °C TL peak.",

keywords = "Defect points, EPR, SrAlO phosphor, TL",

author = "Canaza-Mamani, {Edwar A.} and Cano, {Nilo F.} and Jessica Mosqueira-Yauri and Rao, {T. K.Gundu} and Aynaya-Cahui, {Sandra C.} and Gonsalez-Vasquez, {Amador J.} and Gomes, {Monise B.} and Chubaci, {Jos{\'e} F.D.} and Shigueo Watanabe and Ayala-Arenas, {Jorge S.}",

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year = "2021",

doi = "10.1016/j.jlumin.2021.118585",

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T1 - TL and EPR characteristics of SrAl2O4 phosphor prepared by solid-state reaction method

AU - Canaza-Mamani, Edwar A.

AU - Cano, Nilo F.

AU - Mosqueira-Yauri, Jessica

AU - Rao, T. K.Gundu

AU - Aynaya-Cahui, Sandra C.

AU - Gonsalez-Vasquez, Amador J.

AU - Gomes, Monise B.

AU - Chubaci, José F.D.

AU - Watanabe, Shigueo

AU - Ayala-Arenas, Jorge S.

PY - 2021

Y1 - 2021

N2 - SrAl2O4 phosphor was prepared by solid-state reaction method and characterized using X-ray diffraction (XRD), thermoluminescence (TL) and electron paramagnetic resonance (EPR) spectroscopy. TL glow curve of irradiated phosphor shows three peaks at 135, 260 and 350 °C. The order of kinetics of the three TL peaks is second order with an activation energy of 1.05, 1.60 and 1.93 eV, respectively. EPR studies have been carried out to identify the defect centers induced by gamma irradiation and also to identify the defect centers involved in the TL process in SrAl2O4. Two distinct centers contribute to the observed spectrum at room temperature. Center I exhibiting a four-line hyperfine splitting is identified as an O− ion. O− ion is associated with the high temperature TL peaks at 260 and 350 °C. An eight-line spectrum with a g-value of 2.0068 is attributed to a F+ center (singly ionized oxygen vacancy). This center relates to the 135 °C TL peak.

AB - SrAl2O4 phosphor was prepared by solid-state reaction method and characterized using X-ray diffraction (XRD), thermoluminescence (TL) and electron paramagnetic resonance (EPR) spectroscopy. TL glow curve of irradiated phosphor shows three peaks at 135, 260 and 350 °C. The order of kinetics of the three TL peaks is second order with an activation energy of 1.05, 1.60 and 1.93 eV, respectively. EPR studies have been carried out to identify the defect centers induced by gamma irradiation and also to identify the defect centers involved in the TL process in SrAl2O4. Two distinct centers contribute to the observed spectrum at room temperature. Center I exhibiting a four-line hyperfine splitting is identified as an O− ion. O− ion is associated with the high temperature TL peaks at 260 and 350 °C. An eight-line spectrum with a g-value of 2.0068 is attributed to a F+ center (singly ionized oxygen vacancy). This center relates to the 135 °C TL peak.

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