ESR and TSL study of hole and electron traps in LuAG:Ce,Mg ceramic scintillator |
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| Affiliation: | 1. Key Laboratory of Transparent Opto-functional Inorganic Materials, Shanghai Institute of Ceramics, Chinese Academy of Sciences, 200050 Shanghai, China;2. University of Chinese Academy of Sciences, 100049 Beijing, China;3. Department of Materials Science, University of Milano–Bicocca, via Cozzi 55, 20125 Milan, Italy;4. Institute of Physics AS CR, Cukrovarnicka 10, 16253 Prague, Czech Republic;1. Department of Physics, SGB Amravati University, Amravati, MS 444602, India;2. Department of Physics, Shri Shivaji Science College, Amravati, MS 444602, India;1. Institute of Physics Academy of Sciences of the Czech Republic, Cukrovarnická 10, 16253 Prague, Czech Republic;2. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 11519 Prague, Czech Republic;1. Institut Lumière Matière, UMR5306 Université Lyon1-CNRS, Villeurbanne Cedex, France;2. Institut de Physique, Laboratoire de cristallographie, Université Des Frères Mentouri Constantine 1, Constantine, Algeria;3. European Organization for Nuclear Research, Geneva, Switzerland;4. University of Milano-Bicocca, Piazza dell’Ateneo Nuovo 1, Milano, 20125, Italy;5. Institute for Scintillation Materials of NASU, Kharkiv, Ukraine;6. Princeton University, Priceton, New-Jersey, 08544, USA;1. Institute of Physics AS CR, Cukrovarnicka 10, Prague 6 16253, Czech Republic;2. Faculty of Biomedical Engineering, Czech Technical University in Prague, Sitna Square 3105, Kladno 272 01, Czech Republic;3. Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Brehova 7, Prague 1 11519, Czech Republic;4. Institute for Materials Research, Tohoku University, 2-1-1, Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan;5. New Industry Creation Hatchery Center, Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan |
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| Abstract: | The process of hole and electron localization in LuAG:Ce,Mg ceramics is studied by electron spin resonance (ESR) and thermally stimulated luminescence (TSL). Hole traps, which are created by UV irradiation, are detected in the form of O− centers. Mg-perturbed variants of O− centers are proposed to exist. The thermal stability of such defects is studied, proving that they are stable up to room temperature. The interaction between O− centers and shallow electron traps is studied by thermally stimulated luminescence (TSL) and phosphorescence experiments, which reveal the occurrence of an a-thermal tunneling process between trapped electrons and randomly distributed Ce centers. By correlating the TSL-derived trap parameters and temperature dependent ESR intensities, it is found that O− centers compete with Ce centers in free electron capture. |
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| Keywords: | Hole traps Electron traps Optical ceramics Garnet scintillator Electron spin resonance Thermally stimulated luminescence |
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