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Journal of Synthetic Crystals ›› 2025, Vol. 54 ›› Issue (4): 663-673.DOI: 10.16553/j.cnki.issn1000-985x.2024.0250

• Research Articles • Previous Articles     Next Articles

Design, Synthesis and Luminescent Properties of CaMoO4:Dy3+/Sm3+ White Phosphors

MENG Xiaoyan, GAN Xin, WANG Chunyang, ZHU Yaoxian, YANG Liusai, WU Lidan, DONG Hongxia   

  1. School of Chemistry and Environmental Science, Shangrao Normal University, Shangrao 334001, China
  • Received:2024-10-22 Online:2025-04-15 Published:2025-04-28

Abstract: In this paper, CaMoO4xDy3+(x=0.01~0.05) and CaMoO4:0.03Dy3+/ySm3+(y=0.01~0.05) series phosphors and CaMoO4 matrix were synthesized by hydrothermal method using hexadecyl trimethyl ammonium bromide as complexing agent. The effects of Dy3+ doping and Dy3+/Sm3+ co-doping on the structure, morphology and luminescent properties of the samples were investigated. The results show that Dy3+ doping and Dy3+/Sm3+ co-doping do not change the tetragonal phase of CaMoO4, but the lattice parameters decrease. The micromorphologies of all samples are ellipsoidal. Under the excitation of 353 nm, the strongest emission peak of CaMoO4xDy3+ phosphor is located at 575 nm, which is due to the 4F9/26H13/2 dipole transition of Dy3+, and the optimal doping molar concentration is x=0.03. Under the excitation of 298 nm, the quenching molar concentration of Sm3+ in CaMoO4:0.03Dy3+/ySm3+ phosphor is y= 0.03. The intrinsic emission of rare earth Dy3+ and Sm3+ are obtained through CaMoO4 matrix energy transfer, and the energy transfer of Dy3+ to Sm3+ is also observed. Under the excitation of 405 nm, the CIE coordinates of CaMoO4:0.03Dy3+/ySm3+(y=0.01~0.05) change from cyan region to white region, and the CaMoO4:0.03Dy3+/ySm3+(y=0.03~0.05) phosphors exhibit white emission. Therefore, Dy3+/Sm3+ co-doped CaMoO4 phosphor is a single matrix white LED phosphor with potential application value.

Key words: CaMoO4, Dy3+ doping, Dy3+/Sm3+ co-doping, hydrothermal method, luminescent property, white phosphor

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