Photoluminescence properties of Pb2+ doped M2Mg(BO3)2 (M = Sr, Ba)

Pure and Pb2+ doped M2Mg(BO3)(2) (M = Sr, Ba) materials were synthesized at 900 degrees C for 12 h in air. The phases of the synthesized materials were determined using the powder XRD. The photoluminescence properties of the synthesized phosphors were investigated using a spectrofluorometer at room temperature. The emission and excitation bands of Sr2Mg(BO3)(2): Pb2+ were observed at 330 and 260 nm, respectively. And, the emission and excitation bands of Ba2Mg(BO3)(2): Pb2+ were observed at 381 and 293 nm, respectively. The dependence of the emission intensity on the Pb2+ concentration for the M2-xPbxMg(BO3)(2) (M = Sr, Ba) was studied in detail. It was observed that the optimum concentrations of Pb2+ in Sr2Mg(BO3)(2) and Ba2Mg(BO3)(2) are 0.06 and 0.01 mol, respectively. The Stokes shifts of Sr2Mg(BO3)(2): Pb2+ and Ba2Mg(BO3)(2): Pb2+ phosphors were calculated to be 8159 and 7883 cm(-1), respectively. The luminescence behavior of the Pb2+ ion in M2Mg(BO3)(2) (M = Sr, Ba) is discussed. (c) 2012 Elsevier B.V. All rights reserved.