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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]

Abstract: Pure and Pb2+ doped LiSr4(BO3)3 materials were prepared by a solution combustion synthesis method. The phase analysis of all synthesized materials were determined using the powder XRD. The synthesized materials were investigated using spectrofluorometer at room temperature. The excitation and emission bands of LiSr4(BO3)3: Pb2+ were observed at 284 and 328nm, respectively. The dependence of the emission intensity on the Pb2+ concentration for the LiSr4(BO3)3 were studied in detail. It was observed that the concentration quenching of Pb2+ in LiSr4(BO3)3 is 0.005mol. The Stokes shifts of LiSr4(BO3)3: Pb2+ phosphor was calculated to be 4723cm–1. [Copyright &y& Elsevier]