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:0.3Ce³⁺,0.6Tb³⁺,0.15Mn²⁺ 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.