Li + doped SrAl 2 O 4 :Eu 2+ , Dy 3+ long‐persistent luminescence aluminoborosilicate glass‐ceramics: Preparation and properties

Abstract In the SrO‐Al 2 O 3 ‐B 2 O 3 ‐SiO 2 glass system, a SrAl 2 O 4 :Eu 2+ , Dy 3+ long‐persistent luminescence glass‐ceramic (SAGC) with Li 2 O was successfully synthesized for the first time using the recrystallization‐melting method. The composition, micromorphology, long‐persistent luminescence (LPL) properties, photoluminescence (PL) properties, and water resistance were measured by X‐ray diffractometer, scanning electron microscope, brightness meter, fluorescence spectrophotometer, and pH meter, respectively. The method involves the formation of grains below the glass transition temperature, followed by the formation of the glass phase at a higher temperature, and finally the formation of products through cooling. The samples exhibited green PL and LPL emissions and demonstrated excellent color purity, homogeneity, and LPL luminescence. After doping Li 2 O, the purity and crystallinity of the SrAl 2 O 4 were improved, and scalene hexagonal or monoclinic prismatic SrAl 2 O 4 crystals with high regularity were synthesized in the glass matrix. This research indicates that excellent LPL benefits from the complete crystal structure, abundant crystals, and large crystal size. When the Li 2 O content reached 5 mol%, the crystal size was ∼30 µm, the PL and LPL properties performed best, and greater water resistance was exhibited. The SAGC in this new glass system has potential in optical storage.