Eu-doped SrAl2O4 (Eu:SrAl2O4) crystals are prepared by a floating zone (FZ) method. In photoluminescence (PL), an intense broad emission peak around 510nm due to 5d-4f transition of Eu2+ appear under excitation at 250–450nm. The PL decay time constants are about 800ns due to the 5d-4f transitions of Eu2+. In the nondoped sample, emission peaks around 480 and 560nm are observed upon excitation at 316nm. The X-ray induced scintillation spectra also show an intense broad emission peak around 510nm, and the decay time constants are approximately 500ns. In the pulse height spectra of the 2.5% Eu:SrAl2O4 crystal, the absolute light yield is ~46,000ph/MeV. In thermally stimulated luminescence (TSL) after X-ray irradiation, strong TSL glow peaks are observed at 120 and 400°C. In optically stimulated luminescence (OSL) after X-ray irradiation, emission peaks are observed around 510nm while exposing the samples to the stimulation light at 800nm.
Journal of Luminescence – Elsevier
Published: Aug 1, 2016
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