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Sr 2 CeO 4 , pure and doped with Eu 3+ ions of different concentrations, were synthesized by polyacrylamide gel method. First principles were applied to calculate the electronic structures and band gap of Sr 2 CeO 4 . The results show that a broad emission band originating from Sr 2 CeO 4 host and Eu 3+ emission lines in blue, green,...
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