Abstract
Long-lasting phosphor (LLP) emits photons for a long period of time after the cessation of irradiation without external excitation. LLP exhibits not only a long-lasting emission but also strong fluorescence. The fluorescence and long-lasting emission properties of two types of strontium-aluminate-based LLPs – SrAl 2O 4:Eu 2+, Dy 3+ and Sr 4Al 14O 25:Eu 2+, Dy 3+ – are examined under 14-MeV neutron irradiation. The fluorescent spectra of the LLPs have characteristic peaks due to their dopants and the fluorescent intensity of Sr 4Al 14O 25:Eu 2+, Dy 3+ shows good radiation resistance for the neutrons, with a slight change after increasing the irradiation fluence up to 10 19 n/m 2. Long-lasting emissions are exhibited after neutron irradiation, and the emission spectra have one peak due to Eu 2+. A peak due to Dy 3+ ends immediately when the irradiation is stopped. Further, it is found that there is an optimum neutron fluence at which the longest decay time is obtained.
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