White-light-emitting diode using a single-phase full-color (Ba,Sr)10(PO4)4(SiO4)2:Eu2+ phosphor

New phosphors based on apatite-silicate single matrix doped with Eu ions were prepared by solid state reaction. One phosphor, Ba9.25(PO4)4(SiO4)2:0.75 Eu2+, showed two emission peaks located at 415 nm and 507 nm. In contrast, another phosphor, (Ba6.94Sr2.31)(PO4)4(SiO4)2:0.75 Eu2+, owing to the presence of excess SrF2, exhibited three clear emission peaks at 415 nm, 507 nm, and 565 nm, respectively. This is beneficial for potential use as white-light-emitting diodes.