Luminescence properties of Na2Ca2Si3O9: Eu3+ phosphors via a sol-gel method

The red-emitting Na2Ca2Si3O9:Eu3+ phosphors were synthesized by a sol-gel method.The phase, morphology, photoluminescence properties of the phosphors were well characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and photoluminescence (PL) spectra, respectively. XRD confirmed the material phase as Eu3+-doped Na2Ca2Si3O9. The phosphors can be efficiently excited by near UV light to realize an intense red luminescence (613 nm) corresponding to the electric dipole transition 5D0 → 7F2 of Eu3+ ions. The lifetimes of the phosphors were calculated for various concentrations of Eu3+ ions in Na2Ca2Si3O9. The CIE chromaticity coordinates of the phosphors were calculated and located in the red region.