Microstructure and luminescence of surface-coated nano-BaMgAl10O17:Eu2+ blue phosphor

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]