Phosphor, production method thereof and light emitting instrument

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The present invention aims at providing a chemically stabilized inorganic phosphor, among oxynitride phosphors including alkaline earths, which oxynitride phosphor emits orange or red light at longer wavelengths at higher luminance than conventional sialon phosphors activated by rare earths. The present invention further aims at providing a light emitting instrument based on the phosphor, for a lighting instrument excellent in color rendering property and for an image displaying apparatus excellent in durability. The solving means resides in provision of a fundamental phosphor comprising : as a main component, an inorganic compound comprising : a composition on a pseudo-ternary phase diagram including AO (A is one kind or two or more kinds or element(s) selected from Mg, Ca, Sr, and Ba; and AO is oxide of A), Si3N4, and SiO2 as end members, respectively, and satisfying all of the following conditions : in a composition formula, pAO-qSi3N4-rSiO2 (p+q+r=1), 0.1≤p≤0.950.05≤q≤0.9 and 0≤r≤0.5 and at least a metallic element M (M is one kind or two or more kinds of element(s) selected from Mn, Ce, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb) dissolved in a solid state, in the composition, wherein said composition is selected from an A3Si3O3N4 crystal an A3Si3O3N4 solid solution crystal, an A3Si2O4N2 crystal, an A3Si2O4N2 solid solution crystal, an A3Si3-yO3+yN4-2y crystal (0 ≤ y ≤1.8) , and an A3Si3-yO3+yN4-2y solid solution crystal (0 ≤ y ≤ 1.8).