Sequential two-step optical stimulation in K-feldspars: Correlation among the luminescence signals and implications for modeling parameters

Angeli V., Kitis G., Pagonis V., Polymeris G. S.

JOURNAL OF LUMINESCENCE, vol.226, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 226
  • Publication Date: 2020
  • Doi Number: 10.1016/j.jlumin.2020.117425
  • Journal Name: JOURNAL OF LUMINESCENCE
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC
  • Keywords: Feldspars, BLOSL/IRSL, Tunneling recombination, Crystal structure, Dimensionless density parameter, Unit cell volume, TUNNELING RADIATIVE RECOMBINATION, COMPUTERIZED CURVE DECONVOLUTION, IRSL SIGNALS, OSL SIGNALS, TL, THERMOLUMINESCENCE, SEDIMENTS, EMISSION, MINERALS, QUARTZ
  • Ankara University Affiliated: Yes

Abstract

Luminescence signals from feldspars are of importance in luminescence dosimetry and dating. The present study attempts a correlation between two specific experimental parameters, such as the lifetime of luminescence components and the dimensionless acceptor density parameter rho', as well as the influence of the crystal structure on the luminescence signals. The analysis of the above parameters was completed in three different K-feldspar samples, each one belonging to the structural group of micmcline, sanidine and orthoclase. The stimulations in this manuscript were carried out using blue optically stimulated luminescence (BLOSL) and infrared (IRSL) optically stimulated luminescence, in two different two step experimental protocols. A comparison of these two step protocols is applied for the first time in the literature. A de-convolution analysis was completed with the use of two components, a slow component which can be described by general order kinetics (GOK), and a tunneling component which is necessary to describe the blue light stimulation. The GOK component describes recombination processes taking place only through the conduction band. In order to describe the results of the IR stimulation protocol, two tunneling components were used. The results from this study are encouraging and are in full correlation with published studies in the luminescence literature.