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KMID : 1151820190130040645
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Journal of the Korean Society of Radiology
2019 Volume.13 No. 4 p.645 ~ p.652
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Luminescence Properties of Europium-doped NaSr(PO3)3 Phosphor
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Yoon Chang-Yong
Park Cheol-Woo
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Abstract
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Phosphor with phosphorus doped with rare earth ions was investigated by searching Sr and Eu phosphors suitable for substitution of Eu ions with similar ionic radius to polyphosphate host. The NaSr(PO3)3 phosphor was synthesized by the solid state method and the NaSr(PO3)3:Eu2+ phosphor was prepared by the carbon thermal reduction method. Both of the phosphors were identified by X - ray diffraction. The excitation and emission spectra of NaSr(PO3)3:Eu3+ increased fluorescence intensity and intensity quenching with increasing Eu3+ concentration. The higher the Eu3+ concentration in the emission spectrum, the higher the local symmetry of Eu3+ environment. The mechanism of concentration quenching, in which fluorescence decreases due to the energy transfer between Eu2+ ions with the closest critical distance between Eu2+ ions with increasing Eu2+ ion concentration, was confirmed in the emission spectrum of NaSr(PO3)3:Eu2+ concentration. It is possible to change the fluorescent region through the post-processing of single rare earth ion added phosphors, and it is possible to change the fluorescence by applying the energy transfer and concentration quenching mechanism accordingaccording to the local symmetry of Eu3+ Will be used for high phosphor development.
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KEYWORD
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Luminescence, X-ray diffraction, NaSr(PO3)3, Europium
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