中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 15 No. 2 April 2005 |
（Department of Materials Science, Lanzhou University, Lanzhou 730000, China）
Abstract: In order to prevent BaMgAl10O17∶Eu (BAM) phosphor from thermal degradation, MgF2 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 MgF2 coatings. The photoluminescence and anti-thermal degradation properties of coated BAM were investigated under 254 and 147nm excitations. The optimum anti-thermal degradation properties are obtained at the mass ratio of MgF2 to BAM 0.2% under 254nm excitation and 0.5% under 147nm excitation, respectively. It is considered that trace MgO formed after baked would cause different optimum coating thicknesses under 254 and 147nm excitations.
Key words: BaMgAl10O17; Eu; thermal degradation; sol-gel process; coating
