Abstract: Provided is a method for producing an inorganic fluoride luminescent material having excellent light emission characteristics by using a non-aqueous hydrogen fluoride-containing liquid. The method for producing an inorganic fluoride luminescent material includes: bringing a first inorganic fluoride luminescent material and a non-aqueous hydrogen fluoride-containing liquid having a hydrogen fluoride content in a range of 20% by mass or more and 100% by mass or less into contact with each other to obtain a non-aqueous solution containing ions derived from the first inorganic fluoride luminescent material, and bringing the non-aqueous solution and a non-aqueous organic liquid having a hydrogen fluoride content of less than 20% by mass into contact with each other to precipitate a second inorganic fluoride luminescent material.

Abstract: A nitrogen-containing carbon material includes carbon atoms, nitrogen atoms, and halogen atoms. The nitrogen-containing carbon material has a ratio of a number of moles of pyridinic nitrogen atoms to a total number of moles of the nitrogen atoms that is higher than 59% and a total content ratio of the nitrogen atoms with respect to the nitrogen-containing carbon material that is 7 at % or higher. The nitrogen-containing carbon material includes a fused polycyclic aromatic moiety formed by condensation of three or more aromatic rings, and the fused polycyclic aromatic moiety includes a partial structure for two pyridinic nitrogen atoms to be linked to each other through two carbon atoms.

Abstract: Provided is a method for producing an inorganic fluoride luminescent material using a non-aqueous solution. The method for producing an inorganic fluoride luminescent material includes: either preparing a first non-aqueous solution that contains a first ion, a second ion, and a first non-aqueous hydrogen fluoride-containing liquid, and a second non-aqueous solution that contains a third ion and a second non-aqueous hydrogen fluoride-containing liquid, or preparing a third non-aqueous solution that contains a first ion, a second ion, a third ion, and a third non-aqueous hydrogen fluoride-containing liquid; and either mixing the first non-aqueous solution and the second non-aqueous solution with a non-aqueous organic liquid, or mixing the third non-aqueous solution with a non-aqueous organic liquid, to obtain an inorganic fluoride luminescent material containing a first element M1 and/or ammonium, a second element M2, and a third element M3.