Author: P. Pavithra, Thummala Chengaiah and Borelli Devaprasad Raju

DOI: http://doi.org/10.31788/RJC.2026.1929618

The present investigation used the conventional melt-quenching technique to create an entirely novel set of dysprosium (Dy 3+ ) ion-doped boro-tellurite–alumino–magnesium oxide (BTAMDy) spectacles that containedvarious percentages of Dy2O3. While the Fourier transform infrared (FTIR) spectra showed discrete vibrational bands associated with TeO4 and BO3 structural units, the X-ray diffraction (XRD) patterns verified that the producedspectacles had an amorphous composition. Additionally, to investigate the surface characteristics as well as confirmconsistent constituent dispersion across the samples, scanning electron microscopy (SEM) in conjunctionwithenergy-dispersive X-ray spectroscopy (EDS) was utilized. Based on the Judd–Ofelt (J–O) formalism, optical absorption analysis produced intensity values (Ω2, Ω4, Ω6) that followed the trend Ω2 > Ω6 > Ω4, indicating a highlyasymmetric and covalent environment surrounding Dy 3+ ions. The photoluminescence spectra showed a mildredemission ( 4F9/2 → 6H11/2) together with strong blue ( 4F9/2 → 6H15/2) and yellow ( 4F9/2 →6H13/2) transitions under stimulation at 350 nm. According to lifetime measurements of the 4F9/2 level, the highest emission intensitywasrecorded at 0.5 mol% Dy2O3, after which concentration quenching took place. The yellow-to-blue (Y/B) luminosityratio, associated colour temperature (CT), and computed CIE spectrum dimensions were used to assess the closetowhite light emission behaviour. By tuning the Dy 3+ ion concentration within the boro-tellurite-alumino-magnesiumglass network, this study highlights the material’s capability for applications involving white LEDs and solid-statelighting, demonstrating efficient near-white luminescence performance.

Keywords: Boro tellurite glasses, optical absorption, Photoluminescence, Dy 3+ ions, white LEDs, Radiativetransition probability.