Energy transfer and luminescent properties of Pr^3＋ and/or Dy^3＋ doped NaYF4 and NaGdF4

The phosphors that are able to convert vacuum ultraviolet（VUV） light into visible light are demanded for the development of novel displaying and lighting devices.NaYF4：Pr3＋,Dy3＋,NaGdF4：Pr3＋,NaGdF4：Dy3＋and NaGdF4：Pr3＋,Dy3＋were prepared by hydrothermal synthesis method and their luminescent properties in VUV-vis spectral region were investigated at room temperature.For NaYF4：Pr3＋,Dy3＋,no energy transfer process from Pr3＋to Dy3＋was observed.However,the introduction of Gd3＋into the fluoride lattice led to intense Dy3＋emissions upon Pr3＋4f5d state excitation.Gd3＋acted as an intermediate,resulting in efficient energy transfer from Pr3＋to Dy3＋in NaGdF4.Pr3＋transferred most of its energy to Gd3＋,and then the energy was transferred from Gd3＋to Dy3＋.So NaGdF4：Pr3＋,Dy3＋not only took full advantage of the intense Pr3＋4f5d absorption,but converted the VUV excitation light into the near-white emission of Dy3＋.

Energy transfer and luminescent properties of Pr^3＋ and/or Dy^3＋ doped NaYF4 and NaGdF4

The phosphors that are able to convert vacuum ultraviolet (VUV) light into visible light are demanded for the development of novel displaying and lighting devices. NaYF₄:Pr³⁺,Dy³⁺, NaGdF₄:Pr³⁺, NaGdF₄:Dy³⁺ and NaGdF₄:Pr³⁺,Dy³⁺ were prepared by hydrothermal synthesis method and their luminescent properties in VUV-vis spectral region were investigated at room temperature. For NaYF₄:Pr³⁺,Dy³⁺, no energy transfer process from Pr³⁺ to Dy³⁺ was observed. However, the introduction of Gd³⁺ into the fluoride lattice led to intense Dy³⁺ emissions upon Pr³⁺ 4f5d state excitation. Gd³⁺ acted as an intermediate, resulting in efficient energy transfer from Pr³⁺ to Dy³⁺ in NaGdF₄. Pr³⁺ transferred most of its energy to Gd³⁺, and then the energy was transferred from Gd³⁺ to Dy³⁺. So NaGdF₄:Pr³⁺,Dy³⁺ not only took full advantage of the intense Pr³⁺ 4f5d absorption, but converted the VUV excitation light into the near-white emission of Dy³⁺.