Abstract: A phosphor powder containing a phosphor represented by General Formula (I) below. In General Formula (I), M1 includes at least La and optionally further includes one or more elements selected from the group made of lanthanoid elements other than Y and La, M2 includes at least Ba and optionally further includes one or more elements selected from the group made of Mg, Ca, and Sr, x is equal to or more than 0.005 and equal to or less than 0.2, y is equal to or more than 0 and equal to or less than 0.1, and z is more than 0.44 and equal to or less than 0.99: (Eu(1-x)(1-z)M1xM2(1-x)z)2(Si1-yAly)5N8 . . . (I).

Abstract: A method for manufacturing a phosphor powder of the present invention, in which the phosphor powder contains an inorganic compound in which Eu as an activator is solid-soluted in a crystal represented by Ba26Si51O2N84 or in an inorganic crystal having the same crystal structure as the crystal represented by Ba26Si51O2N84, the method including: a mixing step of mixing a raw material containing each element constituting the inorganic compound to obtain a raw material mixture blended such that b=51 and a/b>(26?c)/51 are satisfied when molar ratios of Ba, Si, and Eu in the raw material mixture are respectively a, b, and c; a firing step of firing the raw material mixture to obtain a fired product; and a cleaning treatment step of subjecting the fired product to an acid treatment and/or a water treatment.

Abstract: A method for manufacturing a phosphor powder of the present invention, in which the phosphor powder contains an inorganic compound in which Eu as an activator is solid-soluted in a crystal represented by Ba26Si51O2N84 or in an inorganic crystal having the same crystal structure as the crystal represented by Ba26Si51O2N84, the method including: a mixing step of mixing a raw material containing each element constituting the inorganic compound to obtain a raw material mixture blended such that b=51 and a/b>(26?c)/51 are satisfied when molar ratios of Ba, Si, and Eu in the raw material mixture are respectively a, b, and c; a firing step of firing the raw material mixture to obtain a fired product; and a cleaning treatment step of subjecting the fired product to an acid treatment and/or a water treatment.

Abstract: A phosphor powder of the present invention is a phosphor powder which contains an inorganic compound in which Eu as an activator is solid-soluted in a crystal represented by Ba26Si51O2N84 or in an inorganic crystal having the same crystal structure as the crystal represented by Ba26Si51O2N84, and which is constituted such that in an emission spectrum obtained by irradiating the phosphor powder with excitation light having a wavelength of 450 nm, when a luminescence intensity at a peak wavelength in a range of equal to or more than 750 nm and equal to or less than 950 nm is P0, and when a luminescence intensity at a peak wavelength in a range of equal to or more than 520 nm and equal to or less than 600 nm is P1, 0.01?P1/P0?0.12 is satisfied by P0 and P1.