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The relationship between thermal activation energy, infrared stimulated luminescence and anomalous fading of K-feldspars

Journal Article


Abstract


  • A strong dependence of thermal activation energy (TAE) on infrared (IR) stimulation time for the infrared stimulated luminescence (IRSL) signal was observed for K-feldspar grains extracted from several sediments and granites from China. A TAE value as low as ∼0.1 eV was observed at the beginning of IR stimulation and increased to ∼0.45 eV after 90 s. For a trap depth of ∼2 eV below the conduction band for the IRSL traps, the TAE value of ∼0.45 eV is consistent with the energy gap between the excited states (∼0.5 eV below the conduction band) and conduction band. This phenomenon is explained as the result of the coexistence of thermally assisted recombination via conduction band or band-tail states hopping and athermal tunnelling recombination of electrons from the excited states under IR stimulation, leading to the observation of a higher anomalous fading rate in the initial part of the IRSL decay curve. © 2010 Elsevier Ltd. All rights reserved.

Publication Date


  • 2010

Citation


  • Li, B. (2010). The relationship between thermal activation energy, infrared stimulated luminescence and anomalous fading of K-feldspars. Radiation Measurements, 45(7), 757-763. doi:10.1016/j.radmeas.2010.04.010

Scopus Eid


  • 2-s2.0-77955226950

Start Page


  • 757

End Page


  • 763

Volume


  • 45

Issue


  • 7

Abstract


  • A strong dependence of thermal activation energy (TAE) on infrared (IR) stimulation time for the infrared stimulated luminescence (IRSL) signal was observed for K-feldspar grains extracted from several sediments and granites from China. A TAE value as low as ∼0.1 eV was observed at the beginning of IR stimulation and increased to ∼0.45 eV after 90 s. For a trap depth of ∼2 eV below the conduction band for the IRSL traps, the TAE value of ∼0.45 eV is consistent with the energy gap between the excited states (∼0.5 eV below the conduction band) and conduction band. This phenomenon is explained as the result of the coexistence of thermally assisted recombination via conduction band or band-tail states hopping and athermal tunnelling recombination of electrons from the excited states under IR stimulation, leading to the observation of a higher anomalous fading rate in the initial part of the IRSL decay curve. © 2010 Elsevier Ltd. All rights reserved.

Publication Date


  • 2010

Citation


  • Li, B. (2010). The relationship between thermal activation energy, infrared stimulated luminescence and anomalous fading of K-feldspars. Radiation Measurements, 45(7), 757-763. doi:10.1016/j.radmeas.2010.04.010

Scopus Eid


  • 2-s2.0-77955226950

Start Page


  • 757

End Page


  • 763

Volume


  • 45

Issue


  • 7