Alloy powder for inorganic funtional material precursor and phosphor

The present invention provides a method for producing a phosphor, comprising a step of heating an alloy, containing two or more metal elements for forming the phosphor, in a nitrogen-containing atmosphere; a composition containing a phosphor produced by the method; and a light-emitting device, display and lighting system using the phosphor. Further, the present invention provides a phosphor made of a nitride or an oxynitride, wherein the phosphor is dispersed in a tenfold weight of water and the electric conductivity of a supernatant liquid obtained by allowing the dispersion to stand for one hour is 50 mS/m or less; a composition containing the phosphor; and a light-emitting device, display and lighting system using the phosphor. An alloy powder that is a material for producing inorganic functional materials such as phosphors, a phosphor with high brightness, and a method for producing the phosphor. An alloy powder for an inorganic functional material precursor contains at least one metal element and at least one activating element M 1 and has a weight-average median diameter D 50 of 5 µ m to 40 µ m. A method for producing a phosphor includes a step of heating an alloy, containing two or more metal elements for forming the phosphor, in a nitrogen-containing atmosphere.