Photoluminescence and Thermoluminescence of Dy 3+ Ion Doped Boro‐Tellurite Glasses for White LED and Dosimetry Applications

Thermoluminescent materials based on rare‐earth‐doped glasses have attracted considerable attention for radiation sensing and photonic applications due to their combined optical and trapping properties. In this work, Dy 2 O 3 ‐doped boro‐tellurite glasses with compositions of (50– x )TeO 2 –20B 2 O 3 –20SrO–5Al 2 O 3 –5La 2 O 3 – x Dy 2 O 3 ( x = 0.00, 0.05, 0.10, 0.50, 1.00, and 1.50 mol%) were synthesized by the melt‐quenching technique. The influence of Dy 3+ incorporation on the structural, optical, and thermoluminescence properties was systematically investigated. X‐ray diffraction patterns confirmed the formation of a fully amorphous glass network for all compositions. UV–vis–NIR absorption spectra revealed characteristic Dy 3+ transitions, while photoluminescence spectra exhibited intense blue and yellow emissions centered at approximately 482 and 575 nm, corresponding to the 4 F 9/2 → 6 H 15/2 and 4 F 9/2 → 6 H 13/2 transitions, respectively. The optimized emission intensity was obtained at 0.5 mol% Dy 2 O 3 , where a balanced blue‐to‐yellow emission ratio resulted in CIE 1931 chromaticity coordinates located within the white‐light region. Thermoluminescence measurements under X‐ray irradiation revealed glow peaks in the range of 455–485 K, and the kinetic parameters were evaluated using Chen’s peak‐shape method. The calculated activation energies, frequency factors, and Figure of Merit values indicate that Dy 3+ incorporation influences the trapping and recombination processes within the glass matrix. These results demonstrate that Dy 2 O 3 ‐doped boro‐tellurite glasses possess promising white‐emitting and thermoluminescence characteristics, suggesting their potential as multifunctional materials for future photonic and radiation‐sensing applications.