A new borate compound NaCa4(BO3)3:xEu2+,xCe3+ co-doped with Eu2+ and, Ce3+ was prepared by combustion synthesismethod using rare-earth nitrates, urea, and boric acid as starting materials. The prepared sample was characterized throughX-ray diffraction (XRD), scanning electron microscope (SEM), and fourier transform infrared spectra (FTIR). The energydispersive x-ray spectrometer (EDX) confirmed the presence of the Na, Ca, B, O, Eu, and Ce. The photoluminescence (PL)excitation and emission spectra of the Eu2+, Ce3+co-doped NaCa4(BO3)3were also investigated using spectrometer at roomtemperature.The excitation spectrum consists of an intense band peaking at 352 nm. The emission spectrum shows a singleintensive band centered at 445 nm, which correspond to the 4f65d1 -4f7. For the excitation wavelength of 352 nm the emissionintensity increases intially with the increase of lanthanide concentration and reaches to the maximum at x = 0.05 nm.Thecritical distance of concentration quenching, the luminescence lifetime have also been investigated.

Keywords: Borates, Combustion method, Rare-earth, Pnosphors, Luminescence