In this paper, we report the obtention of red‐emitting Ca3(PO4)2:Eu3+ phosphor by the solid‐state reaction method. X‐ray diffraction and photoluminescence (PL) measurements were used to investigate the crystal phases, luminescent properties, and optimal Eu3+ doping concentration. To further improve the PL intensity, Na+ acting as a charge compensator was incorporated into the phosphor. The effects of Na+ concentration on the PL properties were studied. It was found that the charge‐compensation phosphor showed greatly enhanced red emission beyond the phosphor without charge compensation. Ca2.3Na0.4(PO4)2:0.3Eu3+ was determined to be the best composition. The charge‐compensation mechanism was analyzed in light of the principles on defect formation and reaction, and the changes of the site centrosymmetry for the activator.
Effects of Na+ concentrations on the intensity of red emission. The inset showed the R/O ratios along with Na+ concentrations.
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