Synthesis and optical properties of Er 3+ and Eu 3+ doped SrAl 2O 4 phosphor ceramic

Abstract

We report, for the first time on luminescence from a Er 3+ doped SrAl 2O 4 phosphor. Effects of Eu 3+ doping were also studied. The influence of rare-earth doping in crystal structure and its optical properties were analysed by means of X-ray diffraction (XRD), Raman scattering, optical absorption, excitation and emission (PL) spectroscopy, thermally stimulated luminescence (TSL) and scanning electron microscope (SEM). Luminescence spectra and luminescence decay curves for Er 3+ transitions in the near infrared region were recorded. The PL maximum for Eu doped SrAl 2O 4 is obtained at 620 nm and corresponds to the orange region of the spectrum. Diffraction patterns reveal a dominant phase, characteristic of the monoclinic SrAl 2O 4 compound and the presence of dopants has no effect on the basic crystal structure of SrAl 2O 4. The shapes of the glow curves are different for each dopant irradiated with either a 90Sr– 90Y beta source, or UV light at 311 nm, and in detail the TL signals differ somewhat between Er and Eu dopants.