Luminescence properties of emission tunable single-phased phosphor La7O6(BO3)(PO4)2: Ce3+, Tb3+, Eu3+.

Emission color tunable single-phased phosphors La 7 O 6 (BO 3 )(PO 4 ) 2 : Ce 3+ , Tb 3+ , Eu 3+ were prepared by a solid state reaction method. The crystal structure, luminescence properties, energy transfer, and co-excitation behavior were investigated in detail. The La 7 O 6 (BO 3 )(PO 4 ) 2 : x Ce 3+ phosphors emit blue light under the excitation at 228 nm, corresponding to the broad 4f-5d transition of Ce 3+ . Concentration quenching phenomenon was observed when the Ce 3+ ion was x = 0.01. By co-doping the Eu 3+ and Tb 3+ ions into La 7 O 6 (BO 3 )(PO 4 ) 2 : Ce 3+ phosphors, the emission color can be tunable from blue to reddish, and then to white. The energy transfer from Ce 3+ to Eu 3+ and the co-excitation of Ce 3+ and Tb 3+ have been investigated and discussed. The color coordinate for the La 7 O 6 (BO 3 )(PO 4 ) 2 : 0.01Ce 3+ , 0.05Tb 3+ , 0.05Eu 3+ phosphor is calculated to be (0.3008, 0.3381). [ABSTRACT FROM AUTHOR]