A novel apatite-based warm white emitting phosphor Ba3GdK(PO4)3F:Tb3+, Eu3+ with efficient energy transfer for w-LEDs

In Ba₃GdK(PO₄)₃F:Tb³⁺, Eu³⁺ phosphors, energy transfer occurs between Tb³⁺ and Eu³⁺. The color hue can be modulated from blue-greenish to orange, and a warm-white-light is realized.