Highly bright multicolor-tunable KSrLu(PO₄)₂:Ce³⁺, Tb³⁺, Mn²⁺ phosphors via efficient energy transfer

Research hotspots about Ce³⁺-Tb³⁺ and Ce³⁺-Mn²⁺ codoped multicolor-tunable materials, has grown rapidly and is still growing. However, few feasible strategies can be employed to achieve the multicolor-tunable luminescence under the premise of maintaining high QE. In this paper, KSrLu(PO₄)₂:0.25Ce presents a high luminescence efficiency with approximately 78% quantum efficiency. Furthermore, Ce³⁺-Tb³⁺ and Ce³⁺-Mn²⁺ codoped optimal samples give a green and red luminescence, which corresponds to a high 61% and 55% quantum efficiency due to a high energy transfer efficiency of Ce³⁺→Tb³⁺ and Ce³⁺→Mn²⁺. Besides, we achieved the precise adjustment of blue, green, orange and pink emissions of KSrLu(PO₄)₂:Ce³⁺, Tb³⁺, Mn²⁺ samples. Meanwhile, KSrLu(PO₄)₂:Ce³⁺, Tb³⁺ and KSrLu(PO₄)₂:Ce³⁺, Mn²⁺ phosphors present a weak thermal quenching: their integrated emission intensity at 500K still keep more than 80% of their initial intensity at room temperature. Therefore, the results might provide a novel multicolor-tunable phosphor for backlight display application.