Determination of the crystal structure and photoluminescence properties of NaEu1-xGdx(MoO4)2 phosphor synthesized by a water-assisted low-temperature synthesis technique

Takuya Hasegawa, Sun Woog Kim, Yusuke Abe, Masaru Muto, Mizuki Watanabe, Tatsuro Kaneko, Kazuyoshi Uematsu, Tadashi Ishigaki, Kenji Toda, Mineo Sato, Junko Koide, Masako Toda, Yoshiaki Kudo

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6 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)25089-25094
Number of pages6
JournalRSC Advances
Volume7
Issue number40
DOIs
Publication statusPublished - 2017 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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    Hasegawa, T., Kim, S. W., Abe, Y., Muto, M., Watanabe, M., Kaneko, T., Uematsu, K., Ishigaki, T., Toda, K., Sato, M., Koide, J., Toda, M., & Kudo, Y. (2017). Determination of the crystal structure and photoluminescence properties of NaEu1-xGdx(MoO4)2 phosphor synthesized by a water-assisted low-temperature synthesis technique. RSC Advances, 7(40), 25089-25094. https://doi.org/10.1039/c7ra01832k