Long Lasting Phosphorescence from Eu2 + Doped Srβ‐Alumina

Abstract

β‐aluminas were successfully synthesized by direct solid‐phase reaction. Contrary to other β‐aluminas. Srβ‐alumina doped with showed two strong phosphorescent peaks at 482 and 502 nm, which were different from the peak of fluorescence (465 nm). These phosphorescent peaks were dependent on the excitation wavelength. The peak at 482 nm was observed after removal of the excitation at a short wavelength below 254 nm, whereas the peak at 502 nm was seen after removal of the excitation at a wavelength between 304 and 365 nm. The afterglow curves also showed different decay behaviors after removal of the light excitation at those different wavelengths. A model has been proposed which indicates that three sites can be occupied by ions in whereas there is only a single site in . © 2000 The Electrochemical Society. All rights reserved.