Red Nitride Phosphor and Production Method Thereof

摘要

A red phosphor where the crystal phase constituting the phosphor is monoclinic Eu-activated CaAlSiN₃. A red phosphor which is Eu-activated CaAlSiN₃ powder having an average particle diameter of 10 mum or less as measured in the non-pulverized state by the laser scattering particle size distribution analysis. A light-emitting device comprising a blue light-emitting element, a yellow phosphor capable of converting the blue light emitted from the blue light-emitting element into yellow light, and the above-described red phosphor capable of converting the blue light emitted from the blue light-emitting element into red light. A method for producing Eu-activated CaAlSiN₃, comprising firing a raw material powder comprising Ca₃N₂, AlN, Si₃N₄ and EuN at 1,400 to 2,000° C. in a nitrogen-containing atmosphere, the Ca₃N₂, AlN and Si₃N₄ giving a composition falling in the region surrounded by a straight line connecting the following four points A to D in the composition diagram of FIG. 1 and EuN being contained in an amount of 0.01 to 10 parts by weight as Eu per 100 parts by weight in total of Ca₃N₂, AlN and Si₃N₄.