Abstract: A phosphor including a crystal phase of an aluminate compound containing a metal element M constituting a luminescent center ion and aluminum, in which the crystal phase contains crystallites, and an average size of the crystallites is 2 to 100 ?m.

Abstract: A method for producing a phosphor having a core-shell structure that includes: a core part formed of a crystal phase of an inorganic compound containing a metal element M constituting a luminescent center ion and aluminum; and a shell part containing at least one element selected from the group consisting of boron and silicon and formed on at least a portion of a surface of the core part, the method including: mixing a raw material of the crystal phase and a raw material of the shell part; and heating the obtained mixture at a temperature at which the raw material of the shell part is liquefied, but a host crystal of a phosphor to be obtained is maintained, in which the raw material of the crystal phase contains a raw material compound having D50 in a particle diameter distribution of 0.2 to 90 ?m and containing aluminum.

Abstract: A phosphor having an elemental composition represented by the following composition formula: SryMg(1?x)MxAlzO(1+y+1.5z) (1), in the formula (1), M represents at least one metal element selected from the group consisting of manganese, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, thulium, and ytterbium, x represents a value of 0.01?x?0.8, y represents a value of 1?y?2, and z represents a value of 10?z?22, wherein a particle diameter D10 at which a cumulative frequency is 10% and a particle diameter D90 at which a cumulative frequency is 90% in a volume-based cumulative particle diameter distribution curve obtained by a laser diffraction scattering method satisfy the following conditions (I) and (II): (I) D90-D10 is less than 67.4 ?m; and (II) D10 is a value of greater than 1.3 ?m and 100 ?m or less.

Abstract: A phosphor having an elemental composition represented by the following composition formula: SryMg(1?x)MxAlzO(1+y+1.5z) (1), in the formula (1), M represents at least one metal element selected from the group consisting of manganese, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, thulium, and ytterbium, x represents a value of 0.01?x?0.8, y represents a value of 1?y?2, and z represents a value of 10?z?22, wherein a full width at half maximum of an XRD peak at 2?=31.7°±0.5 is less than 0.207.

Abstract: A phosphor having an elemental composition represented by the following composition formula: SryMg(1-x) MxAlzO(1+y+1.5z) (1), in the formula (1), M represents at least one metal element selected from the group consisting of manganese, cerium, praseodymium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, thulium, and ytterbium, x represents a value of 0.01?x?0.8, y represents a value of 1?y?2, and z represents a value of 10?z?22, wherein the phosphor has a specific surface area of less than 2.7 m2/g.

Abstract: A fluorescent material has a core-shell structure. The core contains a crystal phase of an inorganic compound having Formula: MxMgaAlyOzNw (A); M represents a metal; × satisfies 0.001 ? × ? 0.3; a satisfies 0 ? a ? 1.0 - ×; y satisfies 1.2 ? y ? 11.3; z satisfies 2.8 ? z ? 18; and w satisfies 0 ? w ? 1.0. The shell is formed on at least a part of a surface of the core and contains boron and/or silicon. The core has a sodium content of 1700 ppm by mass or less and a specific surface area of 0.01 to 4.30 m2/g. A ratio Y/X of a peak area value Y of boron or silicon to a peak area value X of metal M present in the shell satisfies 0 < Y/X ? 0.095 in an EDX measurement of a cross section of the fluorescent material.

Abstract: A fluorescent material has a core-shell structure. The core contains a crystal phase of an inorganic compound having Formula: MxMgaAlyOzNw (A); M represents a metal; x satisfies 0.001?x?0.3; a satisfies 0?a?1.0?x; y satisfies 1.2?y?11.3; z satisfies 2.8?z?18; and w satisfies 0?w?1.0. The shell is formed on at least a part of a surface of the core and contains boron and/or silicon. The core has a tetrahedral site occupancy of M1 of 0.032 or more and a specific surface area of 0.01 to 4.1 m2/g. A ratio Y/X of a peak area value Y of boron or silicon to a peak area value X of M present in the shell satisfies 0<Y/X?0.095 when EDX measurement of a cross section of the fluorescent material is performed.

Abstract: A highly durable spring of the present invention includes a single-layer coating film with a thickness of 450 ?m or less, in which the coating film contains an epoxy resin, a phenolic resin, and zinc. The coating film has high corrosion resistance and chipping resistance even if it is a one thin layer with a thickness of 450 ?m or less. A method of coating a highly durable spring of the present invention includes an application process in which an epoxy resin-based powder coating material which contains an epoxy resin, a phenolic resin, and zinc and is produced by a melt kneading method is applied to a surface of a spring on which a coating-film is formed and a baking process in which the applied epoxy resin-based powder coating material is baked.