Oxynitride phosphor and a light emitting device

摘要

A preferred embodiment according to the present invention provides in one preferred mode an oxynitride phosphor especially suitable for a light emitting device such as but not limited to a white light emitting diode lamp and also such a light emitting device. The oxynitride phosphor in the embodiment is represented by a general formula Ca_x(Si,Al)₁₂(O,N)₁₆:Eu²⁺_y, wherein a Ca composition of x is in a range of from 0.75 to 1.0 and a Eu composition of y is in a range of from 0.04 to 0.25, and wherein a main phase thereof has substantially an alpha SiAlON crystal structure.