Search

Abstract: MgF2 coating on BaMgAl10O17:Eu2+ (BAM) particles was obtained by an emulsion method. The chemical compositions, microstructure, and luminescent performance of surface-coating BAM were characterized by XRD, X-ray photoelectron spectroscopy (XPS), transmission electron microscope (TEM), energy dispersion spectrum (EDS) and vacuum ultraviolet (VUV) excitation, respectively. The results indicate that a compact homogeneous MgF2 film is successfully coated on the surface of BAM particles by forming a chemical bond. Lengthening of fluorescence lifetimes were observed in surface-coated BAM phosphor attributed to less non-radiative rate due to coating. The luminescent performances of surface-coated BAM is improved due to the hanging-bonds and defects on the surface of nano-scale BAM particles being removed as well as non-radiative transition probability decreasing. [Copyright &y& Elsevier]

Abstract: By adopting a feasible microwave-induced solution combustion synthesis (MISCS) method, pure and well-crystallized BaMgAl10O17:Eu2+ (BAM) nanoscale blue phosphors were successfully prepared. The crystallinity, particle size, morphology, chemical composition and luminescent properties were characterized by XRD, FE-SEM, EDS and spectrofluorometer, respectively. The results show that the obtained BAM phosphors have spherical morphology, good crystallinity, and strong blue emission under vacuum ultraviolet (VUV) light excitation compared to those prepared by conventional solution combustion method. [Copyright &y& Elsevier]