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Novel green-emitting Ba 2 Y(BO 3 ) 2 Cl:Ce 3+ ,Tb 3+ phosphors were synthesized by a solid-state method. X-ray diffraction and photoluminescence spectra were utilized to characterize the structures and luminescence properties of the as-synthesized phosphors, respectively. Ba 2 Y(BO 3 ) 2 Cl:Ce 3+ ,Tb 3+ phosphors exhibit blue and green emission bands under the excitation of near-ultraviolet light. An asymmetric blue emission originates from the Ce 3+ ion, whereas the green emission originates from the Tb 3+ ion. A spectral overlap is found between the emission band of the Ce 3+ ion and the excitation band of the Tb 3+ ion, which supports the occurrence of the energy transfer from the Ce 3+ ion to the Tb 3+ ion. Meanwhile, the energy transfer is thoroughly investigated by their photoluminescence decay behaviors. The energy-transfer efficiency from the Ce 3+ ion to the Tb 3+ ion is also calculated, and a possible mechanism is proposed.

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