Effects of Ce³⁺/Dy³⁺ and Ce³⁺/Sm³⁺ co-doping as a luminescent modifier in alumina-borophosphate glasses for w-LED...

Ce³⁺/Dy³⁺ and Ce³⁺/Sm³⁺ co-doped alumino-borophosphate glasses (CDABP/ CSABP) were prepared and characterized for luminescence and SHG efficiency properties. FT-IR and FT-Raman spectra have been utilized to identify different functional groups of Phosphate networks. Various optical properties such as, optical absorption, optical band gap energy (E_g), Urbach energy (ΔE) and linear refractive index (n) of the glasses were determined using UV-Vis spectrometer in the spectral range 200-1200 nm. Scanning Electron Microscopy/Energy Dispersive spectrometry (SEM/EDS) reveals information about the elemental compositional homogeneity as well as the surface morphology of the prepared glasses. Influences of a luminescence co-activator of Ce³⁺/Dy³⁺ and Ce³⁺/Sm³⁺ ions in alumina-borophosphate glasses were interpreted under the excitation wavelength of 300 nm. Two emission peaks detected at 426 nm (blue) and 574 nm (Yellow) in CDABP glass corresponding to the Dy³⁺, whereas three emission peaks traced at 558 nm (green), 598 nm (orange) and 652 nm, (red) in CSABP glass corresponding to the Sm³⁺. The Influence of internal and external quantum efficiency (QE) on the glass's photoluminescence spectrum was measured. The CIE chromaticity obtained from the luminescence spectra, confirming that the CSABP glass emits white light. The colour purity (P_c) and excitation purity (P_e) of the glasses were investigated in order to quantify the quality of light emitted by them. The second harmonic generation (SHG) efficiency of the synthesized glasses was determined without the need of a thermal polling mechanism, and the magnitude was compared to that of Urea and KDP crystal reference samples.