Rapid Combustion Synthesis of Light-Storing-Emitting Material SrAl2O4 : Eu2 + , Dy3 + and Its Spectral Characteristics

Abstract

Light-storing-emitting materials composed of are synthesized via the wet combustion method, and the fluffy resultants obtained are easily pulverized into powder samples. The fluorescent spectra of the sample show the same characteristics as those samples fabricated by the dry method. But the phosphorescent spectrum shows uniquely two peaks at 506 and 535 nm, with the intensity at 506 nm stronger than that at 535 nm, which is presumably ascribed to the splitting of the orbitals of into two groups, and . The lower-energy level has two equal orbitals and , while the higher-energy level has three equal orbitals , and . More photons are stored and released from the higher orbitals, resulting in a higher intensity at the 506 nm peak than that at the 535 nm peak in the phosphorescent spectrum.