Ivanna Medvid

The optical properties of Dy³⁺- and Pr³⁺-doped (B₂O₃)₆₀(ZnO)₁₀(SrO)₁₀(CaO)₁₀(MgO)₁₀ borate glasses were investigated using transmission, photoluminescence (PL), and three-dimensional excitation–emission matrix (EEM) spectroscopy. The transmission spectra revealed characteristic 4f–4f absorption bands of the rare-earth ions used. Dy³⁺-doped glasses exhibited prominent blue and yellow luminescence with the highest emission intensity observed for the 1.0 mol% Dy₂O₃ composition, which also exhibited near-white chromaticity. Pr³⁺-doped glasses showed weaker visible luminescence, with a dominant band in the orange region of the spectrum. In Dy³⁺/Pr³⁺ co-doped glasses, the visible Dy³⁺ emission was reduced, while the EEM maps revealed broadened excitation and additional near-infrared emission features.

1. Among new functional materials for optoelectronics and instrument engineering, thin-film materials based on pure and activated β-Ga2O3 films occupy an important place. They are used in the creat...

Optical-luminescent and dielectric properties of (B₂O₃)₆₀–(ZnO)₂₀–(SrO)₁₀–(CaO)₁₀ borate glasses doped with Dy³⁺ ions have been investigated. The influence of doping the borate glass samples with Dy³⁺ ions on the dependences of dielectric constant and dielectric loss was analyzed in the 4 Hz–200 kHz frequency range. The electrical polarization mechanisms contributing to electrical permittivity and models describing alternating current conductivity were discussed. Absorption analysis identified typical absorption transitions characteristic of Dy³⁺ ions in the prepared glass samples. The photoluminescence excitation spectra were obtained by monitoring emissions at 487 and 580 nm within the 230–440 nm range, with the most intense peak at 350 nm corresponding to ⁶H_15/2 → ⁶P_7/2 transitions in Dy³⁺ ions. The borate glass samples doped with Dy₂O₃ showed excellent luminescence when excited at 350 nm. Modifying the concentration of Dy³⁺ ions enables tuning of the yellow-to-blue emission ratio, allowing control over the emitted light spectrum, including the generation of white light. The sensitivity of yellow emission to changes in the surrounding environment of Dy³⁺ ions additionally provides an avenue for tuning luminescent properties. The CIE coordinates demonstrate that the emission of Dy³⁺-doped glasses is near the white light region, which opens up opportunities for potential applications of this material in white-light-emitting diodes and other optoelectronic devices.