Short-living absorption and emission of CsI(Na)

V. Yakovlev, L. Trefilova, A. Meleshko, Yu Ganja

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Abstract

This paper investigates the short-living absorption and the emission of CsI(Na) under a pulsed electron beam (e=0.25 MeV, t1/2=15 ns and W=0.003...0.16 J/cm2). The bands of singlet self-trapped excitons, as well as Na0 and Vk color centers have been detected in the transient absorption spectrum of CsI(Na). It has been found that the activator luminescence spectrum, peaking at 3.0 eV, fits a Gaussian (E m=3.0 eV and FWHM=0.44±0.02 eV at 80 K) and remains the same at different time delays within 10-810-3 s. The decay kinetics of the 3.0 eV emission has one nanosecond exponential component and two microsecond ones with time constants 1.0 and 3.0 μs, which remain unchanged within 78150 K. It is concluded that the activator emission is due to the radiative annihilation of sodium-perturbed two halide excitons from the non-relaxed singlet state. The pathways of such excitons creation are discussed.

Original languageEnglish
Pages (from-to)2579-2581
Number of pages3
JournalJournal of Luminescence
Volume131
Issue number12
DOIs
Publication statusPublished - 1 Dec 2011

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Keywords

  • Cathode luminescence
  • Color center
  • Short-living absorption
  • Sodium-doped cesium iodide

ASJC Scopus subject areas

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

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