Synthesis and investigation of the optical characteristics of RE3+ activated Ca2Li2Si2O7 (Rare earth = Eu, Tb) phosphor for W-LED application

• Eu 3+ and Tb 3+ ions-doped Ca 2 Li 2 Si 2 O 7 were prepared for LED applications. • Strong luminosity at 613 nm (red) and 545 nm (green) was observed. • FT-IR identified functional groups; XRD provided structural analysis. • SEM gathered morphological data; CIE coordinates determined color. Novel Eu 3+ and Tb 3+ ions-doped Ca 2 Li 2 Si 2 O 7 luminescent materials were prepared by a low-temperature solid-state reaction technique for LED application. The electronic transitions of 5 D 0 → 7 F 2 (Eu 3+ ) and 5 D 4 → 7 F 5 (Tb 3+ ) have caused the luminescent material to exhibit strong luminosity in 613 nm (red) and 545 nm (green), respectively. Fourier transform infrared (FT-IR) spectra were applied for the identification of functional groups, and powder X-ray diffraction (XRD) was used for structural analysis. Morphological data was gathered using scanning electron microscopy (SEM). Its color was also determined by calculating the CIE coordinates. The excitation, PL properties, and luminescence decay time of the emission transitions of Eu 3+ ( 5 D 0 → 7 F 2 ) and Tb 3+ ( 5 D 4 → 7 F 5 ) were measured in order to analyze luminosity spectra.