Details

Autor(en) / Beteiligte

• Průša, Petr
• Kučera, Miroslav
• Vedda, Anna
• Fasoli, Mauro
• Moretti, Federico
• Hanuš, Martin
• Lučeničová, Zuzana
• Vrba, Tomáš
• Nikl, Martin

Titel

Substantial reduction of trapping by Mg co-doping in LuAG:Ce, Mg epitaxial garnet films

Ist Teil von

• Journal of luminescence, 2021-10, Vol.238, p.118230, Article 118230

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2021

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Six Mg2+ co-doped Lu3Al5O12:Ce scintillating garnet films prepared by liquid phase epitaxy, with Mg concentration from 0 to 3000 ppm, were irradiated by X-rays and underwent a series of thermoluminescence measurements from 10 to 720 K. The thermoluminescence signal of epitaxial films originated purely from electron recombination at Ce ions. It was found that the area of all the peaks present in thermoluminescence glow curves decreased rapidly with the increase of Mg concentration; for 3000 ppm, the decrease was by 4–5 orders of magnitude. Moreover, the bright burn effect was significantly suppressed by Mg co-doping. Possible explanations, i.e., trap concentration reduction or increased competition in free electron capture between thermoluminescence traps and Ce4+ centers, were discussed. •LuAG:Ce, Mg epitaxial films are grown for the study of radio- and thermoluminescence.•Mg concentration increase results in lower concentration of Ce3+ and higher of Ce4+.•Thermoluminescence and bright burn are reduced as Mg concentration increases.•Number of trapped electrons is reduced by 4–5 orders of magnitude (3000 ppm Mg).•Hypothesis: Ce4+ ions are by far more effective in electron trapping than Ce3+.