Structural and luminescence properties of RE3+ (RE = Eu, Tb):(MgCa)2Bi4Ti5O20 ceramics

Rare-earth ions (Eu3+, Tb3+) activated magnesium calcium bismuth titanate [(MgCa)2Bi4Ti5O20] ceramics were prepared by conventional solid state reaction method for their structural and luminescence properties. By using XRD patterns, the structural properties of ceramic powders have been analyzed. Emission spectrum of Eu3+:(MgCa)2Bi4Ti5O20 ceramic powder has shown strong red emission at 615 nm (5D0 → 7F2) with an excitation wavelength λexci = 393 nm and Tb3+:(MgCa)2Bi4Ti5O20 ceramic powder has shown green emission at 542 nm (5D4 → 7F5) with an excitation wavelength λexci = 376 nm. In addition, from the measurements of scanning electron microscopy (SEM), Fourier transform-infrared (FTIR) and energy dispersive X-ray analysis (EDAX) results the morphology, structure and elemental analysis of these powder ceramics have been studied.