Intrinsic thermoluminescence and anomalous heating rate effects in undoped K₇SrY₂(B₅O₁₀)₃ Phosphors: A combined...

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 T_m-T_stop 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.