Gel-combustion assisted synthesis of eulytite-type Sr3Y(PO4)3 as a single host for narrow-band Eu3+ and broad-band Eu2+ emissions |
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| Affiliation: | 1. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang, Liaoning 110819, China;2. Institute of Ceramics and Powder Metallurgy, School of Materials Science and Engineering, Northeastern University, Shenyang, Liaoning 110819, China;3. College of New Energy, Bohai University, Jinzhou, Liaoning 121000, China;4. Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan;1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;2. State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, China |
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| Abstract: | A series of eulytite-type Sr3Y1-x(PO4)3:xEu3+ (x = 0–0.13) and Sr3-yY(PO4)3:yEu2+ (y = 0–0.10) phosphors were successfully synthesized via gel-combustion and subsequent calcination in O2 and Ar/H2 atmospheres at 1250 °C, respectively. Detailed crystal structure analysis via Rietveld refinement showed that the phosphors were crystallized in the cubic system (space group I-43d, No. 220), in which the Eu3+ and Eu2+ activators reside at the Y3+ and Sr2+ sites, respectively. The trivalent Eu3+ ions (CN = 6) exhibited typical narrow-band luminescence via intra-4f6 transitions, with the red emission at ~ 615 nm being dominant (5D0 → 7F2 transition, FWHM = 15.9 ± 0.2 nm). The divalent Eu2+ ions (CN = 6 and 9) showed broad-band luminescence ranging from light-blue to blue via 4f65d1 → 4f7 transitions (FWHM = 115 ± 2 nm). The optimal Eu3+ and Eu2+ concentrations were determined to be 10 at% (x = 0.10) and 7 at% (y = 0.07), respectively, and the mechanisms of concentration quenching were discussed. The excitation/emission properties, fluorescence decay kinetics, CIE chromaticity, and particularly the rarely addressed thermal stability of the phosphors were investigated in detail. |
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| Keywords: | Eulytite-type orthophosphate Gel-combustion synthesis |
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