Novel Ce3+/Dy3+co-doped RHA double-function glasses for UV protection and white light emission capability

초록

The Ce3+/Dy3+ co-doped UV-protection glass made from rice husk ash (RHA) waste was successfully produced using the conventional melt-quenching technique. The X-ray fluorescence (XRF) was measured to check the chemicals contained in RHA. The structure and optical characteristics of the glass were analyzed using Fouriertransform infrared (FTIR) spectroscopy, transmittance spectra and photoluminescence (PL) spectra. FTIR spectra indicated the influence of the dopants, showing significant vibrations related to OH and SiO4 in the Ce-0Dy glass. However, these vibration strengths decreased when 0.3 mol% of Dy3+ ions (labeled Ce-0.3Dy) was added. In the transmittance spectra, the undoped sample had an absorption edge at 280 nm (in the UVB region). After adding 0.5 mol% of CeF3 to the glass samples, this edge shifted to a longer wavelength of 340 nm (in the UVA region). This indicates that effective UV protection from UVB and UVA has been achieved. Energy transfer (ET) analysis revealed the potential quenching of photoluminescence emission. Energy transfer studies between Ce3+-> Dy3+ ions, using the Fo<spacing diaeresis>rster-Dexter model, demonstrated the possibility of energy transfer from Ce3+ to Dy3+. Calculations based on the IH model confirmed that dipole-dipole interactions dominate in the prepared glasses. The CIE diagram with varying excitation wavelengths was presented from the violet-blue region (lambda Ex = 350 nm) to the cool white area (lambda Ex = 385 nm). Overall, the Ce-0.3Dy glass effectively absorb UVA and emit white light emission with a high color purity of 32 %, making it suitable for new UV - white light conversion glass.

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