STRUCTURAL AND LUMINESCENCE PROPERTIES OF [Pb.sup.2+]-DOPED [Li.sub.6]Gd[.sub.3] PHOSPHOR

We synthesized pure and [Pb.sup.2+] ion-doped [Li.sub.6]Gd[(B[O.sub.3]).sub.3] phosphors via the solid-state reaction method at 700[degrees]C for 5 h in air. The phase analysis of the synthesized materials was determined using DTA/TGA, XRD, and FTIR. The photoluminescence characteristics of pure and [Pb.sup.2+]-doped phosphors were investigated at room temperature using a photoluminescence spectrophotometer. The emission and excitation bands of [Pb.sup.2+]-doped [Li.sub.6]Gd[(B[O.sub.3]).sub.3] were observed at 313 and 242 nm, respectively. The dependence of the PL intensities on the [Pb.sup.2+] concentration for the [Li.sub.6][Gd.sub.1-x][Pb.sub.x][(B[O.sub.3]).sub.3] (0.005 [less than or equal to] x [less than or equal to] 0.025) phosphors was also studied. The highest emission intensity was obtained from 0.02 mole [Pb.sup.2+]-doped [Li.sub.6]Gd[(B[O.sub.3]).sub.3].