Porous Phosphor Thin Films of Oxyfluoride SiO₂-BaMgF ₄: Eu²⁺ Glass-Ceramics Prepared by Sol-Gel Method

Eu²⁺ ions were incorporated into SiO₂-BaMgF ₄ glass-ceramic thin films using a sol-gel method. The addition of N,N-dimethylformamide to a starting solution resulted in a porous microstructure of the film prepared. The films exhibited blue emission peaking at 420 nm by excitation at 290 nm. The emission was effectively enhanced in the porous film owing to scattering absorption of the excitation light.