Oxyfluoride phosphors and white light emitting diodes including the oxyfluoride phosphor for solid-state lighting applications

摘要

A blue-green emitting Ce³⁺-activated oxyfluoride phosphor for use with a light emitting diode (LED) in solid state lighting applications. The blue-green emitting Ce³⁺-activated oxyfluoride phosphor is represented as:(Sr_1-x-yAE_y)₃(Al_1-zT_z)O₄F:Ce³⁺_x wherein 0x≦0.3, 0≦y≦1, AE includes at least one element selected from alkaline earth metals on the periodic table, for example, Mg, Ca and Ba, 0≦z≦1, and T includes at least one atom selected from Al, B, Ga, and In. The blue-green emitting Ce³⁺-activated oxyfluoride phosphor may be combined with another phosphor to generate the white light. Specifically, the present invention provides for white light generation by combining the blue-green emitting Ce³⁺-activated oxyfluoride phosphor with either a near-ultraviolet (UV) LED and red emitting phosphor, or with a near-UV LED and a red-yellow phosphor.