Energy transfer induced white‐light‐emitting phosphor by co‐doping Ce 3+ , Tb 3+ and Mn 2+ into the single Ba 9 Lu 2 Si 6 O 24 host

In the Ba 9 Lu 2 Si 6 O 24 (BLS) host, Ce 3+ shows cyan emissions peaking at 490 nm under 400 nm excitations. BLS:Tb 3+ 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:Ce 3+ ,Tb 3+ under 400 nm excitations due to effective energy transfers from Ce 3+ to Tb 3+ . BLS:Mn 2+ shows red emissions peaking at 610 nm under 414 nm excitations. By co‐doping Ce 3+ , Tb 3+ and Mn 2+ , 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.