Energy transfer induced white-light-emitting phosphor by co-doping Ce3+, Tb3+ and Mn2+ into the single Ba9Lu2Si6O24 host

In the Ba9Lu2Si6O24 (BLS) host, Ce3+ shows cyan emissions peaking at 490 nm under 400 nm excitations. BLS:Tb3+ only can be effectively excited by 254 nm light and gives rise to green emissions at 553 nm. However, both the cyan and green emissions can be obtained in BLS:Ce3+,Tb3+ under 400 nm excitations due to effective energy transfers from Ce3+ to Tb3+. BLS:Mn2+ shows red emissions peaking at 610 nm under 414 nm excitations. By co-doping Ce3+, Tb3+ and Mn2+, tunable full-color emissions were obtained. The BLS:0.3Ce(3+),0.6Tb(3+),0.15Mn(2+) single phosphor exhibits a white light with a high color rendering index of 85 and a correlated color temperature of 5480 K under 400 nm excitation.