Photoluminescence assessment of Ba2-xEuxSiO4 phosphor prepared through a solid phase reaction technique using silica nanoparticles as a precursor

Abstract

Generally, garnets-based phosphors are being employed in the Phosphor converted white emitting light (pc-WLED) technology. But the deficiency of red spectral components in them makes silicate-based phosphors to be successful. Our study reports the preparation of novel single-phased Ba2-xEux3+SiO4 phosphor obtained by varying dopant (Eu3+) concentration via simple dry solid-phase reaction method. Here, we have used silica nanoparticles as silicate precursor owing to their optical tunability and emissive properties which in turn depend on the occupancy of dopant in the cation site of crystal and morphology, A detailed analysis of the crystal phase and morphology of the silica nanoparticle assisted Ba2-xEux3+SiO4 phosphor (BSS) has been reported. To evaluate the colour output and tunability, the luminescence properties including excitation and emission spectra, asymmetric ratio and concentration quenching were also investigated. The obtained results indicate a rectangular-shaped morphology of BSS with red emission precisely peaked at 592 and 617 nm under the excitation wavelength of 280 nm. The optimum concentration for the luminescence quenching was found to be 7 mol% of Eu3+ in BSS phosphor and was successfully taken for further theoretical experimentations. The critical transfer distance was found to be 1.1 nm. The CIE colour coordinates (x, y) were calculated to be (0.63,0.36). The developed phosphor is found to be a potential candidate for providing enough emission at the red spectral region.