Enhancement of Red Emission in Aluminum Garnet Yellow Phosphors by Sb 3+ Substitution for the Octahedral Site

The synthetic compounds of Sb 3+ ion‐substituted lanthanide aluminum garnet doped with cerium powders have been prepared by solvothermal method at 230°C and then calcined at 1500°C. These particles have spherical morphology with an average size of about 2 μm, which indicates the good luminescent characteristics. Tb 3 (SbAl)Al 3 O 12 :Ce 3+ , and Gd 3 (SbGa)Al 3 O 12 :Ce 3+ showed not only the red shift but also increased broadness with increased red to green ratio as compared with YAG:Ce 3+ phosphor. The color coordination of Ce 3+ ‐doped Y 3 Al 2 Al 3 O 12 , Tb 3 (SbAl)Al 3 O 12 , and Gd 3 (SbGa)Al 3 O 12 are (0.315, 0.341), (0.332, 0.331), and (0.337, 0.330), respectively. These results demonstrate that the possibility for the use of Tb 3 (SbAl)Al 3 O 12 and Gd 3 (SbGa)Al 3 O 12 phosphors to enhance the white light generation in the field of white light‐emitting diodes.