Abstract
Fluorescence and long-lasting emission properties of Sr 4 Al1 4 O 25 :Eu2+, Dy3+ are examined by irradiating it by protons and helium and oxygen particles. Fluorescence spectra exhibit three strong peaks at 400, 480, and 570 nm. The first two peaks are attributed to the luminescence of Eu2+, and they confirm the long-lasting emission property. The peak at 570 nm is attributed to the luminescence of Dy3+; Dy3+ exhibits no luminescence after the cessation of the irradiation. Radiation damages show activator dependence, and Eu is more sensitive to incident particles than Dy is. The radiation damages also show incident particle dependence, and the magnitude of damage is related to the electronic and nuclear energy transfers of the particles. Long-lasting emission is observed after the cessation of irradiation by proton and helium, and the decay time of the emission is different for different incident particles.
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