Abstract
AbstractIn this paper, we report the preparation of a red‐emitting NaCaPO4:Eu3+ phosphor by the solid‐state method at 900 °C, also the effects of Eu3+ concentration on its luminescent properties were investigated. To achieve charge compensation, additional Na+ acting as a charge compensator was incorporated into the phosphor. Under near‐ultraviolet (UV) excitation, the luminescent properties as a function of additional Na+ concentration were systematically studied with a fixed optimal Eu3+ concentration. It was found that charge‐compensated phosphors showed greatly enhanced red emission at 619 nm, compared with the phosphor without charge compensation. Na1.3Ca0.4PO4:0.3Eu3+ was deduced to be the best composition and its luminescent intensity was stronger than that of commercial red‐emitting phosphors for white light‐emitting diode application.magnified imageThe emission spectra of as‐prepared NaCa0.7PO4:0.3Eu3+ (a), Na1.3Ca0.4PO4:0.3Eu3+ (b), and commercial Y2O2S:Eu3+ (c) phosphors excited by 395 nm.
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