Impacts of core shell structure on structural and photoluminescence properties of CaTiO₃:Sm³⁺, Li⁺ nanoparticles for solid state display applications

Abstract

Li+ (0.25–1.0 mol %) co-doped CaTiO3:Sm3+ (3 mol %) nanoparticles (NPs) and SiO2@CaTiO3:Sm3+ (3 mol %), Li+(0.25–1.0 mol %) core–shell NPs were synthesized via facile combustion technique using Oxalyl Dihydrazide (ODH) as a fuel and well characterized by using Powder x-ray diffraction (PXRD), Transmission electron microscopy (TEM), Diffuse reflectance spectroscopy (DRS) and Photoluminescence (PL) spectroscopy. The effect of Li+ with varying concentration and the influence of SiO2 coating on the luminescence properties of the prepared nanophosphors were investigated in detail. Emission spectra of SiO2 coated CaTiO3: Sm3+ (3 mol %), Li+ (0.25–1.0 mol %) core–shell nanophosphors exhibit strong orange red emission (601 nm) dominated by 4G5/2–6H7/2 transition of Sm3+ ions under visible light excitation (465 nm). All the obtained results suggested that the mentioned nanophosphors provides a platform for fabricating other new functional materials which can be applied in the field of W-LEDs, biological imaging and solid state display applications.