Controlled synthesis and luminescent properties of assembled spherical YPₓV₁₋ₓO₄:Ln³⁺ (Ln = Eu, Sm, Dy or Tm) phosphors with high quantum efficiency
2015
An, Zhibin | Xiao, Xiuzhen | Yu, Jun | Mao, Dongsen | Lu, Guanzhong
YPₓV₁₋ₓO₄ (x = 0.3–0.9) assembled spheres with tetragonal phase were prepared hydrothermally under a simple and mild method with the assistance of EDTA. The structures and shapes of the prepared samples were significantly affected by the reaction conditions (hydrothermal treatment time, organic additive, pH value and the amount of EDTA in the synthesis solution). The characteristic emission of the spherical YPₓV₁₋ₓO₄:Ln³⁺ (Ln = Eu, Sm, Dy or Tm) phosphors were investigated in detail. The results showed that the light color of the YP₀.₃V₀.₇O₄ microspheres can be easily adjusted by doping different lanthanide activators; Y₀.₉₃Sm₀.₀₇P₀.₃V₀.₇O₄ and Y₀.₉₅Eu₀.₀₅P₀.₃V₀.₇O₄ exhibited strong orange-red and red emission, respectively, and Y₀.₉₃Sm₀.₀₇P₀.₃V₀.₇O₄ has a higher quantum efficiency of 76.8%. For the Y₀.₉₇Dy₀.₀₃PₓV₁₋ₓO₄ (x = 0.3–0.9) samples, both emission intensities of Dy³⁺ and VO₄³⁻ increase with increasing the P amount, and the quantum efficiency of Y₀.₉₇Dy₀.₀₃P₀.₉V₀.₁O₄ can reach 92%. It can also be found that the light color of the Y₀.₉₇Dy₀.₀₃PₓV₁₋ₓO₄ samples can be tuned by changing the ratio of P/V, and Y₀.₉₇Dy₀.₀₃P₀.₅V₀.₅O₄ can emit white light under UV excitation.
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