A new method for unambiguous determination of trap parameters from afterglow and TSL curves connection: Example on garnets

Khanin, Vasilii; Venevtsev, Ivan; Spoor, Sandra; Boerekamp, Jack; Dongen, Anne-Marie van; Wieczorek, H.; Chernenko, Kirill; Buettner, Daniela; Ronda, Cees; Родный, П. А.

doi:10.1016/j.optmat.2017.05.040

Cited by 17 publications

(20 citation statements)

References 28 publications

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“…The observed maximum of the curve (3) corresponds to the lifetime of carriers on Yb-related traps (τ Y b ) at RT (for detailed explanation of the procedure please see Refs. 28,45 Comparable frequency factors, in the range of s=10 11 ÷ 10 13 s −1 , are reported in the literature for the deep and/or impurity-related traps in complex garnets. 20,52 The data is presented in the Table 1.…”

Section: Evaluation Of the Glow Curvesmentioning

confidence: 80%

“…Previous experiments (partially published in 25,28 ) have shown that selection of raw materials sources and co-doping with rare-earth ions or 3d transition metals has a strong correlation to experimentally observed TSL peaks. The integral TSL peak intensity is increase with impurity (co-dopant) content, and any aforementioned impurity-related TSL peak corresponds only to the presence of a specific impurity.…”

Section: Connection Between Tsl and Afterglowmentioning

confidence: 96%

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Modeling and Assessment of Afterglow Decay Curves from Thermally Stimulated Luminescence of Complex Garnets

et al. 2019

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Afterglow is an important phenomenon in luminescent materials and can be desired (e.g. persistent phosphors) or undesired (e.g. scintillators). Understanding and predicting afterglow is often based on analysis of thermally stimulated luminescence (TSL) glow curves assuming the presence of one or more discrete trap states. Here we present a new approach for the description of the time-dependent afterglow from TSL glow curves using a model with a distribution of trap depths. The method is based on the deconvolution of the energy dependent density of occupied traps derived from TSL glow curves using Tikhonov regularization. To test the validity of this new approach, the procedure is applied to experimental TSL and afterglow data for Lu 1 Gd 2 Ga 3 Al 2 O 12 :Ce ceramics co-doped with 40 ppm of Yb 3+ or Eu 3+ traps. The experimentally measured afterglow curves are compared with simulations based on models with and without the continuous trap depth distribution. The analysis clearly demonstrates the presence of a distribution of trap depths and shows that the new approach gives a more accurate description of the experimentally observed afterglow. The new method will be especially useful in understanding and reducing undesired afterglow in scintillators.

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Section: Evaluation Of the Glow Curvesmentioning

confidence: 80%

Section: Connection Between Tsl and Afterglowmentioning

confidence: 96%

Modeling and Assessment of Afterglow Decay Curves from Thermally Stimulated Luminescence of Complex Garnets

et al. 2019

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“…It is known that the latter can be attributed to various rare-earth and transition metal impurities, such as Yb, Eu, Cr, V, etc. (Dorenbos et al 2015a;Khanin et al 2017). The low-temperature TSL structure is usually attributed to various intrinsic defects, such as antisites or vacancies (Fasoli et al 2011).…”

Section: Resultsmentioning

confidence: 99%

Thermal quenching of luminescence in (Lu,Gd,Y)3(Ga, Al)5O12:Ce complex garnet ceramics at high and low temperatures

Родный

Venevtsev

Khanin

2021

Physics of Complex Systems

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Cerium-doped complex garnets with the general formula (Lu,Y,Gd) 3 ,(Ga,Al) 5 O 12 :Ce are promising materials to be used in PET and CT scanners. By modifying garnet composition (bandgap engineering), one can adjust its scintillation properties to fit a specific set of requirements. In certain compositions, Ce 3+ luminescence intensity can decrease upon cooling (negative thermal quenching). The reason for that is still a matter of active debate. This article is focused on negative thermal quenching in Ce-doped (Lu,Gd) 3 (Ga,Al) 5 O 12 garnet ceramics. We have measured thermally stimulated luminescence, temperature dependence of the X-ray excited luminescence intensity, and other scintillation properties of samples which have different Lu and Ga content and were annealed in different conditions. We discuss that negative thermal quenching in our samples can be attributed to the process of charge carrier localization on traps at lower temperatures.

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“…Керамики YAG : Ce,Yb; YAG : Ce,Cr; YAG : Ce,Yb,Gd и (Gd,Lu) 3 (Al,Ga) 5 O 12 были синтезированы по методике, описанной ранее в работах [7,[11][12][13]. Керамики были получены путем смешивания порошков исходных оксидов Y 2 O 3 , Lu 2 O 3 , Gd 2 O 3 , Al 2 O 3 и Ga 2 O 3 с добавлением оксидов соответствующих примесей с концентрацией примерно 0.1%, добавлением связующих органических материалов; прессованием и термообработкой для выжигания органических материалов.…”

Section: методика экспериментаunclassified

“…Имеется ряд требований к временным характеристикам сцинтилляторов, например, низкий уровень послесвечения, отсутствие вторичных компонентов распада в сцинтилляционной вспышке [7]. Эти явления обусловлены наличием центров захвата в виде собственных и примесных дефектов в кристалле, при этом при комнатной температуре глубокие ловушки ответственны за послесвечение, а время затухания сцинтилляции связано с тепловым выделением носителей из мелких ловушек.…”

Section: Introductionunclassified

Применение Высокочастотного Эпр/Эсэ Для Идентификации Примесного Состава И Электронной Структуры Керамик На Основе Гранатов

Edinach¹,

Успенская²,

Gurin³

et al. 2019

Физика Твердого Тела

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Electron paramagnetic resonance (EPR) spectra of Ce3+, Yb3+, Cr3+, and Gd3+ impurity ions in yttrium aluminum garnet Y3Al5O12 (YAG) ceramics were detected and identified at frequency of 94 GHz. The advantage of measuring the EPR spectra in the high-frequency range compared to the standard EPR technique is shown, which makes it possible to separate the EPR spectra characterized by different anisotropic g-factors and also to isolate the EPR signals due to the splitting of the fine structure for centers with high-spin states. In ceramics with a high content of magnetic Gd3+ ions, EPR and electron spin echo (ESE) spectra of multi-ionic gadolinium complexes were observed, and EPR spectra of complexes with the maximum number of exchange-coupled gadolinium ions are seen at low temperatures. The temperature dependences of the EPR spectra indicates ferromagnetic ordering of exchange-coupled complexes of gadolinium.

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A new method for unambiguous determination of trap parameters from afterglow and TSL curves connection: Example on garnets

Cited by 17 publications

References 28 publications

Modeling and Assessment of Afterglow Decay Curves from Thermally Stimulated Luminescence of Complex Garnets

Modeling and Assessment of Afterglow Decay Curves from Thermally Stimulated Luminescence of Complex Garnets

Thermal quenching of luminescence in (Lu,Gd,Y)3(Ga, Al)5O12:Ce complex garnet ceramics at high and low temperatures

Применение Высокочастотного Эпр/Эсэ Для Идентификации Примесного Состава И Электронной Структуры Керамик На Основе Гранатов

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