Effect of B2O3 on the Photoluminescence Properties of Sr4Al14O25: Eu2+, Dy3+ Phosphor

An efficient blue-green phosphor, Sr4Al14O25: Eu2+, Dy3+, was prepared by solid-state synthesis method. B2O3 was used as a flux for the synthesis of phosphorous materials. The different mol % of B2O3 was employed during the synthesis. X-ray powder diffraction (XRD) confirmed the formation of Sr4Al14O25: Eu2+, Dy3+ phosphor in an orthorhombic phase. The synthesized phosphorous materials were further investigated by XRD, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and photoluminescence studies. The phosphor, Sr4Al14O25: Eu2+, Dy3+ shows broad band ultraviolet (UV) excited luminescence in the blue-green region (lambda(max) = 491 nm) due to the transition from the 4f(6)5d(1) to the 4f(7) level of the Eu2+ ion. The phosphorous material with 75 mol % of B2O3 shows high brightness and long persistent luminescence whereas the phosphorous material without B2O3 shows no emission and persistence of luminescence.