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Abstract: Pure and Pb2+ doped M2Mg(BO3)2 (M=Sr, Ba) materials were synthesized at 900°C for 12h 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 260nm, respectively. And, the emission and excitation bands of Ba2Mg(BO3)2: Pb2+ were observed at 381 and 293nm, respectively. The dependence of the emission intensity on the Pb2+ concentration for the M2−x Pb x Mg(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 0.01mol, respectively. The Stokes shifts of Sr2Mg(BO3)2: Pb2+ and Ba2Mg(BO3)2: Pb2+ phosphors were calculated to be 8159 and 7883cm–1, respectively. The luminescence behavior of the Pb2+ ion in M2Mg(BO3)2 (M=Sr, Ba) is discussed. [Copyright &y& Elsevier]

Abstract: Li6CaB3O8.5: M3+ (M3+: Dy and Sm) phosphors were synthesized by a solution combustion synthesis. The synthesized materials were characterized by using the powder XRD. The emission and excitation spectra of these materials were measured at room temperature with a spectrofluorometer. Both Li6CaB3O8.5: Dy3+ and Li6CaB3O8.5: Sm3+ phosphors emit red, yellow and green light. Consequently, these materials are promising phosphors for white LEDs. [Copyright &y& Elsevier]