Abstract
Eu 2+ doped A 0.5Zr 2(PO 4) 3 ( A=Ca, Sr, Ba) phosphors with the NASICON structure were synthesized by a co-precipitation method. Their photoluminescent and structural properties were investigated by photoluminescent spectroscopy and powder X-ray Rietveld analysis, which determined two sites for Eu 2+ ions in the host structure, 3 a and 3 b. The Eu–O bond lengths were increased by changing alkaline earth ions from Ca to Ba, causing Eu 2+ emission bands to shift from blue-green to blue. A correlation was observed between the peak wavelength positions and the Eu–O bond length. The photoluminescent properties are discussed in terms of crystal field strength and nephelauxetic effect, and a schematic diagram of Eu 2+ emissions is proposed for the Eu 2+ doped NASICON phosphor.
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