Explanation for the multi-component scintillation of cerium fluoride through the equilibrium and photophysical investigation of cerium(Iii)-fluoro complexes

Zsolt Valicsek, M. Kovács, Ottó Horváth

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Abstract

CeF3 displays favorable scintillation properties, which have been utilized for decades in various solid-state systems. Its emission undergoes multi-component decays, which were interpreted by lattice defects and so-called intrinsic features herein. This study of the complex equilibria in connection with photophysical behavior of the cerium(III)-fluoride system in solution gave us the possibility to reveal the individual contribution of the [CeIIIFx(H2O)9−x]3−x species to the photoluminescence. Spectrophotometry and spectrofluorometry (also in time-resolved mode) were used, and combined with sophisticated evaluation methods regarding both the complex equilibria and the kinetics of the photoinduced processes. The individual photophysical parameters of the [CeIIIFx(H2O)9−x]3−x complexes were determined. For the kinetic evaluation, three methods of various simplifications were applied and compared. The results indicated that the rates of some excited-state equilibrium processes were comparable to those of the emission decay steps. Our results also contribute to the explanation of the multi-component emission decays in the CeF3-containing scintillators, due to the various coordination environments of Ce3+, which can be affected by the excitation leading to the dissociation of the metal-ligand bonds.

Original languageEnglish
Article number1462
JournalNanomaterials
Volume9
Issue number10
DOIs
Publication statusPublished - Oct 2019

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Keywords

  • Cerium(III)-fluoro complexes
  • Complex equilibria
  • Emission lifetime
  • Multi-component decay
  • Spectrophotometry and spectrofluorometry

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Materials Science(all)

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