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The blue long-lasting phosphorescence (LLP) phenomenon was observed for Eu 2+ -doped SrO–B 2 O 3 glasses prepared in the reducing atmosphere. The phosphorescence peaks at about 450nm due to the 4f5d→4f transition of Eu 2+ . With the doping of different amounts of Eu 2+ , the concentration-quenching phenomenon was observed for both the LLP and photoluminescence...
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