Green chemistry preparation and characterization of borosilicate glass doped with dysprosium using degraded silica gel for white-light emission

초록

This study focuses on the preparation and characterization of dysprosium (Dy3+)-doped borosilicate glass, using degraded silica gel (DSG) as a network former instead of high-purity silica. The glasses were synthesized using the melt quenching method at 1200 degrees C and the chemical formula (69-X)B2O3-18Li2O-12BaO-XDSG-1.0Dy2O3, where X represents the concentration of degraded silica gel. The resulting glasses absorbed photons across ultraviolet, visible, and near-infrared wavelengths. The optimal DSG concentration for maximum photoluminescence was determined to be 10 mol%, which produced a color-correlated temperature (CCT) range of 4077-4649 K, exceeding the warm CCT threshold of 4000 K. The CIE color coordinate chart suggests that these samples are suitable for laser and white-light applications. The I-H model (with S = 6) confirmed dipole-dipole interactions during the energy transfer between Dy3+ ions. The glasses exhibited lifetimes in the millisecond range. Additionally, we prepared glass samples with varying Dy2O3 content in a suitable host (10Silicagel XDy glasses), maintaining the optimal DSG concentration at 10 mol%. The photoluminescence showed clear emission characteristics of Dy3+, closely resembling the radioluminescence spectra. Under excitation at lambda Ex = 387 nm, the developed glass exhibited two strong emission peaks at 576 nm (4F9/2 -> 6H13/2) and 484 nm (4F9/2 -> 6H15/2). The results showed that the glass doped with 1.0 mol% Dy2O3 had the highest emission intensity, confirming that degraded silica gel is a promising alternative to high-purity SiO2 for producing efficient, luminescent, and environmentally friendly white-light optical materials.

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