Preparation and characterization of BaMgAl_(10)O_(17):: Eu phosphor coated with MgF2 by sol-gel process

摘要

In order to prevent BaMgAl_(10)O_(17) : Eu (BAM) phosphor from thermal degradation, MgF_2-coatings on the surface of BAM were prepared by a sol-gel process. The coatings were characterized by X-ray photoelectron spectroscopy and scanning electron microscopy. The results indicate that BAM is successfully coated with homogenous , close MgF_2 coatings. The photoluminescence and anti-thermal degradation properties of coated BAM were investigated under 254 and 147 nm excitations. The optimum anti-thermal degradation properties are obtained at the mass ratio of MgF_2 to BAM 0. 2 percent under 254 nm excitation and 0. 5 percent under 147 nm excitation, respectively. It is considered that trace MgO formed after baked would cause different optimum coating thicknesses under 254 and 147 nm excitations.