Synthesis of Sr0.99Eu0.01AlSiN3 from intermetallic precursor

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  • WATANABE Hiromu
    Mitsubishi Chemical Group Science and Technology Research Center, Inc.
  • KIJIMA Naoto
    Mitsubishi Chemical Group Science and Technology Research Center, Inc.

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Strontium europium aluminum silicon nitride Sr0.99Eu0.01AlSiN3 was synthesized as a major phase by heating a single phase Sr1-xEux(Al0.5, Si0.5)2 intermetallic compound at 2173 K under a N2 gas pressure of 190 MPa, while mixture of SrSiN2, AlN, Sr2Si5N8, and trace amount of Sr0.99Eu0.01AlSiN3 was obtained from mixture of binary nitrides. From the intermetallic precursor, polycrystalline sample of Sr0.99Eu0.01AlSiN3 approximately 3 μm was obtained as major phase. Nitrogen pressure lower than 80 MPa resulted in the impurity phase, Sr2Si5N8 and AlN formation. The particle composition and shape of the purified sample were more homogeneous than those of the sample made from nitride mixture. The higher yield and homogeneity of the product were attributed to the higher reactivity and homogeneous distribution of the elements in the single phase intermetallic precursor. The structure of Sr0.99Eu0.01AlSiN3 was confirmed to be an isotypic structure of CaAlSiN3 in the orthorhombic space group Cmc21, analyzed by powder X-ray diffraction. The lattice parameters are a = 9.8096(1), b = 5.75856(9), c = 5.16880(7) Å, cell volume = 291.982(7) Å3. It shows an intence orange-red photoluminescence by 5d → 4f transition of Eu2+ at around 610 nm under excitation ranging from ultraviolet to 525 nm. The photoluminescence intensity was comparable or superior to those of SrAlSiN3:Eu2+ and CaAlSiN3:Eu2+ phosphor made from conventional nitride mixture method.

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