Abstract:

Dy ³⁺, Eu ³⁺ co-doped Y₃MgAl₃SiO₁₂ phosphors were prepared by high temperature solid state reaction method. The structure and spectral characteristics of the samples were characterized by XRD and fluorescence spectrometer. The crystal sites and spectral characteristics of Dy ³⁺/Eu ³⁺ in Y₃MgAl₃SiO₁₂ host along with energy transfer mechanism between both ions were investigated. Under the excitation of 367 nm near-ultraviolet light, the emission spectrum of Y₃MgAl₃SiO₁₂:Dy ³⁺, Eu ³⁺ con-tained the characteristic transition of 6F9/2 to 6H15/2 (487nm blue emission) and 6H13/2 (592 nm yellow emission) of Dy ³⁺ and the 5D0 7F2 and 5D0 7F4characteristic emission of Eu ³⁺ (616 nm and 710 nm red emission). There were energy transfers of quadrupole quadrupole interaction between Dy ³⁺ and Eu ³⁺ resulting from optical overlap between the PL of Dy ³⁺ and the PLE of t Eu ³⁺ in the range of 400~500 nm. Supposed that packaging the near-ultraviolet LED chip, the phosphor provided a strategy to realize single-substrate warm white LED illumination by adjusting the doping concentration ratio of Dy ³⁺ and Eu ³⁺.

Key words: phosphor, garnet, Y₃MgAl₃SiO₁₂, Dy ³⁺ Eu ³⁺co-doping, energy transfers, LED