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 500 K 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. (C) 2019 Elsevier B.V. All rights reserved.