Spectral-kinetics properties of activator emission centers in CsI: Eu

V. Yakovlev, L. Trefilova, A. Karnaukhova, N. Ovcharenko

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Abstract

It has been found that only three types of emission centers are responsible for bands at 2.69, 2.78 and 2.67 eV in CsI:Eu crystals grown in vacuum. Within the framework of a suggested model a single dipole Eu2+-v c - is responsible for 2.69 eV band, a two-dipole cluster 2(Eu2+-vc -) for 2.78 eV band and a three-dipole cluster 3(Eu2+-vc -) for 2.67 eV band. The emission at 2.69 and 2.67 eV decays exponentially with time constant 0.42 and 0.9 μs, respectively. The decay kinetics of the emission at 2.78 eV has two exponential components with time constant 0.15 and 0.51 μs. It has been experimentally ascertained that the single dipole, two-dipole and three dipole clusters exist at Eu concentration less than 0.01 mass%; from 0.005 to 0.03 mass% and more than 0.03 mass%, respectively.

Original languageEnglish
Pages (from-to)146-148
Number of pages3
JournalJournal of Luminescence
Volume144
DOIs
Publication statusPublished - 5 Aug 2013

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Keywords

  • Activator-vacancy dipole
  • Decay kinetics
  • Europium-doped cesium iodide
  • Photoluminescence

ASJC Scopus subject areas

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

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