Realizing cool and warm white-LEDs based on color controllable (Sr,Ba)2Al3O6F:Eu2+ phosphors obtained via a microwave-assisted diffusion method

A broadband emitting Sr_1.75Ba_0.2Al₃O₆F: 0.05Eu²⁺ phosphor emitting cool white light under NUV (Fig. a(i)) and blue LEDs (Fig. b(i)). With a preferred red phosphor, this system produced natural white light with a higher CRI (Fig. a(ii) & b(ii).