Orange-emissive Ce 3+ /Eu 2+ co-doped Sr 3 Al 2 O 5 Cl 2 phosphors were synthesized by a solid-state reaction. The large overlap between the emission spectrum of blue Sr 3 Al 2 O 5 Cl 2 :Ce 3+ and the excitation spectrum of orange Sr 3 Al 2 O 5 Cl 2 :Eu 2+ , and the shortening trend in lifetime of Ce 3+ donors with increasing Eu 2+ concentration in Sr 3 Al 2 O 5 Cl 2 :Ce 3+ , Eu 2+ provide the strong evidence of energy transfer from Ce 3+ to Eu 2+ ions. It supports that the orange emission intensity of the optimal co-doped phosphor is 1.5 times stronger than that of single Eu 2+ -doped one. The Sr 3 Al 2 O 5 Cl 2 :Ce 3+ , Eu 2+ phosphor is a promising orange-emitting phosphor for warm-white-light-emitting diode because of its effective excitation in the near ultraviolet range.