Abstract
Eu3+ ions activated BaLaMgSbO6 phosphors were successfully synthesized by the solid-state reaction method using NH4Cl as the flux. The influence of NH4Cl, structure, morphology and photoluminescent properties of as-prepared powders were investigated in detail. Long-range ordering of B-site cations existed in this double perovskite. With increasing the amount of NH4Cl, the morphology of phosphors changed from regular polyhedron shape to globoid shape. Broad and strong A1g mode existed in the Raman spectrum. The absorption intensity of charge transfer band was higher than the intensity of characteristic f–f absorption of Eu3+. The luminescence intensity of 5D0–7F2 (electric dipole transition) was much higher than that of 5D0–7F1 (magnetic dipole transition). The optimum adding amount of NH4Cl was 10.0 wt% while excited by the CTB and the phosphor emitted intense red light. The CIE chromaticity coordinates indicated that the phosphors showed good color purity. Therefore the synthesized phosphor is a potential light conversion red material for light emitting diode.
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