关键词: CaMoO₄, Dy³⁺掺杂, Dy³⁺/Sm³⁺共掺杂, 水热法, 发光性能, 白光荧光粉

Abstract: In this paper, CaMoO₄：xDy³⁺(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 CaMoO₄：xDy³⁺ phosphor is located at 575 nm, which is due to the ⁴F_9/2→⁶H_13/2 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