Intracenter processes induced by electron beam and 337 nm laser light in CsI:Tl

V. Yakovlev, L. Trefilova, A. Karnaukhova, A. Shpilinskaya

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1 Citation (Scopus)

Abstract

Investigated are the spectral-kinetic properties of the activator luminescence excited in CsI:Tl crystal by a pulsed electron beam and by a pulsed nitrogen laser at λ = 337.1 nm, that corresponds to the long-wave decline of the A-absorption band. It is found that the decay kinetics of 2.6 and 2.25 eV luminescence bands excited by an electron beam at 80 K is mono-exponential with the time constants τ = 4 μs and τ = 13 μs, respectively. The decay kinetics of each from the luminescence bands under the laser excitation is bi-exponential due to the presence of one more component with time constant τ = 900 ns. This sub-microsecond component dominates in the bi-exponential kinetics, and the value of its time constant is determined by the time of the electron transfer from the metastable Ψ sub-level of the excited 62P3/2 state to the ground 62P1/2 state of Tl0 center. Phonon-assisted processes causing population of the radiative states of Tl+ centers responsible for 3.0, 2.25 and 2.6 eV luminescence bands are discussed in detail.

Original languageEnglish
Pages (from-to)454-461
Number of pages8
JournalFunctional Materials
Volume26
Issue number3
DOIs
Publication statusPublished - 2019

Keywords

  • Charge transfer
  • Decay kinetics
  • Luminescence
  • Thallium doped cesium iodide
  • Tl-perturbed exciton

ASJC Scopus subject areas

  • Materials Science(all)

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