LAUSR

Abstract A series of novel red-emitting La6Ba4Si6O24F2:Sm3+ (LBSOF:Sm3+) phosphors was synthesized by a conventional solid state reaction. The crystal structure and atomic coordinates of La6Ba4Si6O24F2:Sm3+ were characterized by Rietveld refinement. Luminescent properties of as-synthesized La6Ba4Si6O24F2:Sm3+ phosphors are studied by measuring the photoluminescence/photoluminescence excitation (PL/PLE) spectra, decay life time, and thermal quenching. The results indicate that composition-optimized LBSO:1%Sm exhibits orange-red emission peaks located at 564, 601, 608 and 648 nm attributed to the 4G5/2 → 6H5/2, 4G5/2 → 6H7/2, 4G5/2 →6H7/2 and 4G5/2 → 6H9/2 transitions of the Sm3+ ions correspondingly. In addition, the electronic band structure and density of states for LBSOF and La6Ba4Si6O24F2:Sm3+ are studied by the first principles calculations. The white LED was fabricated by combining a 405 nm chip and blue/green emitting phosphors; the potential of such LED for further applications was demonstrated.