Optical determination of the width of the band-tail states, and the excited and ground state energies of the principal dosimetric trap in feldspar

Svenja Riedesel, Georgina King, Amit Kumar Prasad, Raju Kumar, Adrian A. Finch, Mayank Jain

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Abstract

We constrain parameters that are thought to determine thermal stability of the infrared stimulated luminescence (IRSL)signal in a suite of 13 compositionally different feldspar samples by optical probing. We focus specifically on the excited and ground state of the principal trap and the width of the sub-conduction band-tail states. Excitation spectra measured at room temperature result in approximate trap depth of about 2.04 eV and the excited state energy at 1.44 ± 0.02 eV, irrespective of feldspar composition for the sample's measured here. Fitting the non-resonant rising continuum of the excitation spectra suggests that the width of the band-tail states accessible from the ground state of the trap (ΔE)ranges from 0.21 to 0.47 eV at room temperature between the different samples. Photoluminescence measurements are used to constrain the full sub-conduction band-tail width (Urbach width, E u)using the excitation-energy-dependent emission (EDE), resulting in values ranging from 0.26 to 0.81 eV. While the depth of the principal trap and its main excited state seem to be independent of feldspar composition, the difference between ΔE and E u seems to be related to sample K-content.

Original languageEnglish
Pages (from-to)40-51
Number of pages12
JournalRadiation Measurements
Volume125
Early online date03 Sept 2018
DOIs
Publication statusPublished - 01 Jun 2019

Keywords

  • trap depth
  • IR resonance
  • band-tail states
  • excitation spectrum
  • emission spectrum
  • excitation-energy-dependent emission
  • Excitation-energy-dependent emission (EDE)
  • Band-tail states
  • Excitation spectrum
  • Trap depth
  • Emission spectrum

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