Photoluminescence properties of a novel phosphor, Na3La9O3(BO3)8:RE3+(RE=Eu,Tb)

The new oxyborate phosphors, Na3La9O3(BO3)8:Eu3+ (NLBO:Eu) and Na3La9O3(BO3)8:Tb3+ (NLBO:Tb) were prepared by solid-state reactions. The photoluminescence characteristics under UV excitation were investigated. The dominated emission of Eu3+ corresponding to the electric dipole transition 5D0→7F2 is located at 613 nm and bright green luminescence of NLBO:Tb attributed to the transition 5D4→7F5 is centered at 544 nm. The concentration dependence of the emission intensity showed that the optimum doping concentration of Eu and Tb is 30% and 10%, respectively.