Determination of the crystal structure and photoluminescence properties of NaEu₁₋ₓGdₓ(MoO₄)₂ phosphor synthesized by a water-assisted low-temperature synthesis technique
2017
Hasegawa, Takuya | Kim, Sun Woog | Abe, Yusuke | Muto, Masaru | Watanabe, Mizuki | Kaneko, Tatsuro | Uematsu, Kazuyoshi | Ishigaki, Tadashi | Toda, Kenji | Satō, Mineo | Koide, Junko | Toda, Masako | Kudo, Yoshiaki
A single-phase red-emitting NaEu(MoO₄)₂ phosphor with nanosized particles was synthesized using a water-assisted solid state reaction (WASSR) method, a new low-temperature synthesis method developed by our group. NaEu(MoO₄)₂ exhibits a monoclinic structure with a space group C2/c (no. 15), which is composed of a Na/EuO₈ dodecahedron with the site occupancy of Na/Eu = 1 : 1 and an MoO₄ tetrahedron. To enhance the emission intensity of the NaEu(MoO₄)₂ phosphor, Gd³⁺ was doped into the Eu³⁺ sites and NaEu₁₋ₓGdₓ(MoO₄)₂ (0 < x ≤ 0.50) samples were synthesized using the WASSR method. The emission intensity of the phosphors was successfully enhanced by increasing the Gd³⁺ content in the samples with 0 ≤ x ≤ 0.30, but was reduced with x > 0.30. This indicates that the optimum composition of the phosphor for achieving a high emission intensity that is ∼3.8 times higher than that of the NaEu(MoO₄)₂ (x = 0) phosphor is NaEu₀.₇₀Gd₀.₃₀(MoO₄)₂. These phosphors exhibit a granular particle morphology with the particle size of the phosphor being ∼200 nm.
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