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Effect of 14-MeV neutrons on strontium-aluminate-based long-lasting phosphor

To, Kentaro  ; Shikama, Tatsuo*; Katsui, Hirokazu*; Nagata, Shinji*; Tsuchiya, Bun*; Yamauchi, Michinori*; Nishitani, Takeo

Fluorescence and long-lasting emission properties of two types of Long-lasting phosphors (LLPs), SrAl$$_{2}$$O$$_{4}$$:Eu$$^{2+}$$,Dy$$^{3+}$$ and Sr$$_{4}$$Al$$_{14}$$O$$_{25}$$:Eu$$^{2+}$$,Dy$$^{3+}$$, were 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$$_{4}$$Al$$_{14}$$O$$_{25}$$:Eu$$^{2+}$$,Dy$$^{3+}$$ shows good radiation resistance for the neutrons 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$$^{2+}$$. Further, it is found that there is an optimum neutron fluence at which the longest decay time is obtained.

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Category:Materials Science, Multidisciplinary

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