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A homogeneous Eu2W2O9 phase with small grains (∼4.0μm) was formed for the specimens fired below 1175°C. As the firing temperature was increased above 1150°C, grain growth occurred and the grain shape changed from faceted to round. The excitation spectra of the Eu2W2O9 phosphor were similar to those of the Eu2(WO4)3 phosphor, but the absorption band due to the O2−→W6+ ligand to metal charge transfer...
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