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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: M2Mg(BO3)2:Sm3+ (M:Sr and Ba) phosphors were synthesized by a solution combustion synthesis method followed by heating of the precursor combustion ash at 900°C in air. 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 Sr2Mg(BO3)2:Sm3+ and Ba2Mg(BO3)2:Sm3+ phosphors emit a strong in orange-red region. It was observed that the optimum concentration of Sm3+ in Sr2Mg(BO3)2 and Ba2Mg(BO3)2 are 0.01 and 0.04mol, respectively. Finally, the relation between the photoluminescence properties of Sm3+ and host compositions was discussed in detail. [Copyright &y& Elsevier]

Pure and Pb 2+ doped Ba 2 Be 2 B 2 O 7 materials were prepared by a solution combustion synthesis method. The phase analysis of all synthesized materials was carried out using the powder XRD. The synthesized phosphors were investigated using spectrofluorometer at room temperature. The excitation and emission bands of Ba 2 Be 2 B 2 O 7 :Pb 2+ were observed at 284 and 396 nm, respectively. The dependence of the emission intensity on the Pb 2+ concentration for the Ba 2 Be 2 B 2 O 7 was studied in detail. It was observed that the concentration quenching of Pb 2+ in Ba 2 Be 2 B 2 O 7 is 0.04 mol. The Stokes shifts of Ba 2 Be 2 B 2 O 7 :Pb 2+ phosphor were calculated to be 9959 cm −1 . [ABSTRACT FROM AUTHOR]