A combined study of the thermoluminescence and electron paramagnetic resonance of point defects in ZrO2:Er3+

Lokesha, H.S.; Chithambo, M.L.

doi:10.1016/j.radphyschem.2020.108767

Cited by 16 publications

(15 citation statements)

References 31 publications

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“…It is observed from the literature that for cubic ZrO 2 , the EPR signals displayed at g = 1.99 and 1.98, after swift heavy ion irradiation, are close to theoretical predicted values of the F + type center. The EPR spectra of ZrO 2 :Er show a signal centered at g = 1.99 and enhanced after gamma irradiation . Thus, it is proposed here that center III must be assigned to the F 2 + center with g = 1.99, an aggregate of a singly ionized oxygen vacancy.…”

Section: Resultsmentioning

confidence: 72%

“…The EPR spectra of ZrO 2 :Er show a signal centered at g = 1.99 and enhanced after gamma irradiation. 69 Thus, it is proposed here that center III must be assigned to the F 2 + center with g = 1.99, an aggregate of a singly ionized oxygen vacancy. The detailed reasoning for the assignment of the F 2 + center is discussed in ionoluminescence of the ZrO 2 section.…”

Section: ■ Introductionmentioning

confidence: 97%

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Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

et al. 2021

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Ion beam analysis methods are very sensitive to analyze the defects and impurities in insulators and semiconductors. The present study focuses on an investigation of the nature of defects in monoclinic ZrO 2 and spectroscopic properties of ZrO 2 :Sm 3+ (1 mol %) phosphor using ionoluminescence (IL) under the excitation of 100 MeV Si 7+ ions. The structures of the combustion-synthesized ZrO 2 and ZrO 2 :Sm 3+ samples were revealed to be monoclinic as analyzed through X-ray diffraction, Raman spectroscopy, and selected area electron diffraction methods. Structural parameters were assessed utilizing Rietveld refinement of the obtained XRD data using GSAS II software. The average particle size of ZrO 2 and ZrO 2 :Sm 3+ samples was found to be 77 ± 2 and 72 ± 3 nm, respectively, as determined from transmission electron microscopy images. The electronic structure and the oxygen vacancy defect population were analyzed using experimental measurements [viz ionoluminescence (IL), photoluminescence (PL), PL lifetime decay, electron paramagnetic resonance (EPR), and diffuse reflectance spectroscopy (DRS)]. The prominent IL and PL emission peaks seen at 499 nm in monoclinic ZrO 2 are attributed to the F + type center that was assigned to the F 2 + centeran aggregate of the singly ionized oxygen vacancies. ZrO 2 :Sm 3+ (1 mol %) samples display Sm 3+ characteristic IL emission peaks between 562−582, 600−620, 635−673, and 719 nm, corresponding to ( 4 G 5/2 → 6 H 5/2 ), ( 4 G 5/2 → 6 H 7/2 ), ( 4 G 5/2 → 6 H 9/2 ), and ( 4 G 5/2 → 6 H 11/2 ) transitions under 100 MeV Si 7+ ion excitation for various fluences. The 100 MeV Si 7+ ion-induced ion track radius (damaged cross section) and local temperature were estimated through the thermal spike model to be 0.53 nm and 700 K (the duration is about 10 −13 second), respectively. CIE coordinates fall near the yellow color region and then slightly shift toward the green color region with an increase of fluence because of the lattice distortion and change of the Sm 3+ symmetry site.

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Section: Resultsmentioning

confidence: 72%

Section: ■ Introductionmentioning

confidence: 97%

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

et al. 2021

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“…This signal is associated with paramagnetic Zr 3+ ions, which were probably formed during the synthesis of the initial ZrO 2 nanopowders. The ESR signal of Zr 3+ ions has already been detected earlier in unirradiated ZrO 2 [ 27 , 42 ] and ZrO 2 :Er [ 28 ] nanopowders. The signal with g ⊥ = 1.975 and g II = 1.957–1.958 was identified in them as bulk Zr 3+ .…”

Section: Resultsmentioning

confidence: 68%

“…The signal with g ⊥ = 1.975 and g II = 1.957–1.958 was identified in them as bulk Zr 3+ . In [ 28 , 29 ], an ESR signal with identical g ⊥ but different g II = 1.905–1.928 was assigned to surface Zr 3+ ions. The g factor of the paramagnetic Zr 3+ found by us in the initial pellets makes it possible to identify it as bulk Zr 3+ .…”

Section: Resultsmentioning

confidence: 99%

“…One of the most sensitive methods for studying radiation-induced defects in materials is electron spin resonance (ESR) spectroscopy. The main paramagnetic defects in ZrO 2 are centers associated with Zr 3+ ions (surface and bulk Zr 3+ , T -center) [ 27 , 28 , 29 , 30 , 31 ], oxygen hole-centers or OHCs (O − centers) [ 28 , 32 ], and F- type (singly ionized oxygen vacancies ( F + ) and divacancies ( F 2 + )) [ 27 , 28 , 30 , 33 ].…”

Section: Introductionmentioning

confidence: 99%

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Paramagnetic Defects and Thermoluminescence in Irradiated Nanostructured Monoclinic Zirconium Dioxide

et al. 2022

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The ESR spectra of nanostructured samples of monoclinic ZrO2 irradiated by electrons with energies of 130 keV, 10 MeV, and by a beam of Xe ions (220 MeV) have been studied. It has been established that irradiation of samples with electrons (10 MeV) and ions leads to the formation of radiation-induced F+ centers in them. Thermal destruction of these centers is observed in the temperature range of 375–550 K for electron-irradiated and 500–700 K for ion-irradiated samples. It is shown that the decrease in the concentration of F+ centers is associated with the emptying of traps responsible for thermoluminescence (TL) peaks in the specified temperature range. In the samples irradiated with an ion beam, previously unidentified paramagnetic centers with g = 1.963 and 1.986 were found, the formation of which is likely to involve Zr3+ ions and oxygen vacancies. Thermal destruction of these centers occurs in the temperature range from 500 to 873 K.

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Photoluminescence and thermoluminescence properties of pure and rare‐earth‐doped ZrO₂ prepared by Pechini‐type sol–gel

Uzun,

Yıldız,

Öztürk

2023

Luminescence

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In this paper, photoluminescence and thermoluminescence properties of ZrO2, ZrO2:Dy3+, ZrO2:Dy3+–Gd3+, ZrO2:Dy3+–Yb3+, ZrO2:Dy3+–Er3+, and ZrO2:Dy3+–Sm3+ phosphors synthesized by the Pechini method were investigated. The crystal structure, thermal properties, morphology, photoluminescence and thermoluminescence properties were investigated using XRD, DTA/TGA, SEM, PL and TL, respectively. The room temperature emission bands corresponding to 4F9/2→6HJ (J=9/2, 11/2, 13/2 and 15/2) transitions of Dy3+ ions were measured. The phosphors were analysed using Tm‐TSTOP, variable dose, and computerized glow curve fitting methods. Reusability, dose‐response, and fading characteristics were investigated. The phosphors have a natural TL emission that vanished by heating treatment. Moreover, new peaks with similar properties to the natural emissions were observed after high‐dose irradiation and long‐term fading experiments. The glow curves of the phosphors have thirteen individual peaks and many low and high‐temperature satellite peaks. The origin of the peaks is ZrO2 host material and doping with RE (Gd3+, Dy3+, Yb3+, Er3+ and Sm3+) does not lead to a new glow peak. The dopants cause drastic changes in individual peak intensities of ZrO2.The initial fading rates of all the phosphorus are relatively fast, but it slows down as time goes on.

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A combined study of the thermoluminescence and electron paramagnetic resonance of point defects in ZrO2:Er3+

Cited by 16 publications

References 31 publications

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

Paramagnetic Defects and Thermoluminescence in Irradiated Nanostructured Monoclinic Zirconium Dioxide

Photoluminescence and thermoluminescence properties of pure and rare‐earth‐doped ZrO₂ prepared by Pechini‐type sol–gel

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A combined study of the thermoluminescence and electron paramagnetic resonance of point defects in ZrO2:Er3+

Cited by 16 publications

References 31 publications

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO2 and Spectroscopic Properties of ZrO2:Sm3+ Phosphor

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO2 and Spectroscopic Properties of ZrO2:Sm3+ Phosphor

Paramagnetic Defects and Thermoluminescence in Irradiated Nanostructured Monoclinic Zirconium Dioxide

Photoluminescence and thermoluminescence properties of pure and rare‐earth‐doped ZrO2 prepared by Pechini‐type sol–gel

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Product

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Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

Unraveling the Charge State of Oxygen Vacancies in Monoclinic ZrO₂ and Spectroscopic Properties of ZrO₂:Sm³⁺ Phosphor

Photoluminescence and thermoluminescence properties of pure and rare‐earth‐doped ZrO₂ prepared by Pechini‐type sol–gel