Employing one crystalline phase to gain different phosphor emissions for distinctive applications: Preparation, crystallization and luminescence of SrAl2B2O7 with different additions via glass ceramic technique

Abstract

SrAl2B2O7 phosphor was crystallized via glass-ceramic technique. The effect of adding TiO2, Eu2O3, Dy2O3 and CeO2 on both crystallization process and luminescent properties were studied using differential thermal analysis (DTA), X-Ray diffraction analysis (XRD), scanning electron microscope (SEM), Fourier-Transform infrared absorption spectra (FT-IR), optical ultra violet (UV) -visible near infrared (NIR) absorption and fluorescence spectrophotometer. The batches were melted around 1450°C. New method to revealed reducing atmosphere was applied. DTA results show broad exothermic peak revealing surface crystallization. The XRD patterns depict crystallization of pure SrAl2B2O7 in hexagonal form. Presence of CeO2 enhances the crystallization of SrAl2B2O7 phase while TiO2 inhibit it. Increasing the time or temperature of heat treatment didn’t affect the nature of the crystalline phase. Optical UV–visible NIR absorption and luminescent properties clarified the presence of titanium and cerium ions as Ti4+ and Ce3+ form, while europium present in both Eu2+ and Eu3+. The resulting phosphor revealed different colors depending on the excited wavelength used and heat treatment applied.