Intrinsic thermoluminescence and anomalous heating rate effects in undoped K7SrY2(B5O10)3 Phosphors: A combined Tm–Tstop and GOK deconvolution study

Alathlawi H. J., Barad A., Madkhali O., Souadi G., Sharahili M., Hakami J., ...Daha Fazla

Applied Radiation and Isotopes, cilt.225, 2025 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 225
  • Basım Tarihi: 2025
  • Doi Numarası: 10.1016/j.apradiso.2025.112092
  • Dergi Adı: Applied Radiation and Isotopes
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aquatic Science & Fisheries Abstracts (ASFA), Chemical Abstracts Core, Chimica, Compendex, EMBASE, Food Science & Technology Abstracts, INSPEC, MEDLINE, Pollution Abstracts
  • Anahtar Kelimeler: Anomalous heating rate, Dosimetric materials, K7SrY2(B5O10)3 phosphor, Thermoluminescence
  • Çukurova Üniversitesi Adresli: Evet

Özet

This work offers the first detailed analysis of the thermoluminescence (TL) properties of undoped K7SrY2(B5O10)3 phosphors prepared using a conventional solid-state method. Unlike doped systems, the TL signal in this material originates solely from intrinsic defects, making it a cost-effective and rare-earth-free option for radiation dosimetry. TL glow curves induced by β-irradiation were analyzed using Computerized Glow Curve Deconvolution (CGCD) in combination with the General Order Kinetics (GOK) model, yielding ten distinct and well-resolved peaks with activation energies ranging from 0.71 to 1.76 eV and frequency factors from 3.4 × 109 to 4.2 × 1012 s−1. The Tm–Tstop analysis confirmed the presence of these ten trap levels and showed evidence of both discrete and distributed trapping sites. In addition, anomalous heating rate (HR) effects and dose–response behavior illustrated non-classical recombination dynamics and a clear transition from linear to sublinear TL response at high doses. These findings indicate that K7SrY2(B5O10)3 can serve as an intrinsically active TL material, potentially suitable for low-cost, rare-earth-free dosimetry.