Synthesis of Sr_<0.99>Eu_<0.01>AlSiN_3 from intermetallic precursor

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Strontium europium aluminum silicon nitride Sr_<0.99>Eu_<0.01>AlSiN_3 was synthesized as a major phase by heating a single phase Sr_<1-x>Eu_x(Al_<0.5>, Si_<0.5>)_2 intermetallic compound at 2173K under a N_2 gas pressure of 190MPa, while mixture of SrSiN_2, AlN, Sr_2Si_5N_8, and trace amount of Sr_<0.99>Eu_<0.01>AlSiN_3 was obtained from mixture of binary nitrides. From the intermetallic precursor, polycrystalline sample of Sr_<0.99>Eu_<0.01>AlSiN_3 approximately 3μm was obtained as major phase. Nitrogen pressure lower than 80MPa resulted in the impurity phase, Sr_2Si_5N_8 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 Sr_<0.99>Eu_<0.01>AlSiN_3 was confirmed to be an isotypic structure of CaAlSiN_3 in the orthorhombic space group Cmc2_1, 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) Å^3. It shows an intence orange-red photoluminescence by 5d→4f transition of Eu^<2+> at around 610nm under excitation ranging from ultraviolet to 525nm. The photoluminescence intensity was comparable or superior to those of SrAlSiN_3:Eu^<2+> and CaAlSiN_3:Eu^<2+> phosphor made from conventional nitride mixture method.
社団法人日本セラミックス協会の論文
2009-01-01

Synthesis of Sr_<0.99>Eu_<0.01>AlSiN_3 from intermetallic precursor

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