Novel Ba-Sc-Si-oxide and oxynitride phosphors for white LED

Alkaline earth silicates, which comprise a host material doped with rare-earth minerals, show excellent luminescence properties with various crystal structures and high stability. From results of this study, we report luminescence properties of Ba9Sc2Si6O24:Eu2+ and Ba9Sc2+δSi6O24−3δN3δ:Eu2+ as a novel alkaline earth silicate and silicon oxynitride phosphors for white LEDs. Using a conventional solid-state reaction, Ba9Sc2Si6O24:Eu2+ samples were synthesized and Ba9Sc2+δSi6O24−3δN3δ:Eu2+ samples were obtained by nitrization of Ba9Sc2+δSi6O24:Eu2+. The samples can be excited by blue light, exhibiting green (Ba9Sc2Si6O24:Eu2+) and yellow (Ba9Sc2+δSi6O24−3δN3δ:Eu2+) efficiently, which are emissions for use in white LEDs essentially.