Synthesis and Photoluminescence Characteristics of CaIn2O4: Dy3+ Phosphors Co- Doped with Gd3+, Zn2+ or Al3+ Ions

Novel warm-white emitting phosphors CaIn2O4:Dy3+ co-doped with Gd3+, Zn2+, or Al3+ ions were prepared by solid state reaction. In this paper, a strategy of co-doping with different ions was used with the aim of affecting the luminescence properties of CaIn2O4:0.6%Dy3+ under NUV excitation. The luminescence intensities of CaIn2O4:0.6%Dy3+ were enhanced by 0.2% Gd3+ or 0.2% Zn2+ ions co-doping under 367 nm excitation, but lowered by co-doping with 0.2% Al3+ ions. Furthermore, the chromaticity coordinates of CaIn2O4:0.6%Dy3+ can be tuned from the cold-white region to warmwhite region with Gd3+ or Zn2+ ions co-doping. These findings show that CaIn2O4:0.6%Dy3+ , 0.2% Gd3+, and CaIn2O4:0.6%Dy3+, 0.2% Zn-2+ have potential application value as new warm-white LED phosphors.