Measurement of non-equilibrium carriers dynamics in Ce-doped YAG, LuAG and GAGG crystals with and without Mg-codoping

M. T. Lucchini, O. Buganov, E. Auffray, P. Bohacek, M. Korjik, D. Kozlov, S. Nargelas, M. Nikl, S. Tikhomirov, G. Tamulaitis, A. Vaitkevicius, K. Kamada, A. Yoshikawa

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Non-linear absorption spectroscopy in pump and probe configuration has been used to test the population of non-equilibrium carriers in Ce-doped Y3Al5O12 (YAG), Lu3Al5O12 (LuAG), and Gd3AlxGa(5-x)O12 (GAGG) crystals with and without codoping by Mg2+ ions. A faster rise time of the induced optical density has been observed in all crystals codoped with Mg with respect to that in Mg-free samples. A significant difference in the time evolution of the differential optical density in GAGG with respect to YAG and LuAG crystals has also been measured. In both GAGG:Ce and GAGG:Ce,Mg an absorption band with maximum in the blue-green range and a decay time of 1.4 ps is present. This band is due to the absorption by free electrons before they are trapped or re-captured by Ce3+ ions. A broad absorption band in the yellow-red region with very short rise time and a decay time longer than 150 ps has been observed in all the Ce-doped garnets under study and can be attributed to the absorption from the Ce3+ excited states.

Original languageEnglish
Pages (from-to)1-7
Number of pages7
JournalJournal of Luminescence
Volume194
DOIs
Publication statusPublished - 2018 Feb
Externally publishedYes

Keywords

  • Excitation transfer
  • Multi-component garnet crystals
  • Non-linear absorption spectroscopy
  • Scintillators

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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    Lucchini, M. T., Buganov, O., Auffray, E., Bohacek, P., Korjik, M., Kozlov, D., Nargelas, S., Nikl, M., Tikhomirov, S., Tamulaitis, G., Vaitkevicius, A., Kamada, K., & Yoshikawa, A. (2018). Measurement of non-equilibrium carriers dynamics in Ce-doped YAG, LuAG and GAGG crystals with and without Mg-codoping. Journal of Luminescence, 194, 1-7. https://doi.org/10.1016/j.jlumin.2017.10.005