RED PHOSPHOR, METHOD FOR PRODUCING THE SAME, AND LIGHT-EMITTING ELEMENT

摘要

PROBLEM TO BE SOLVED: To provide a red phosphor particle having high emission intensity of red light.

SOLUTION: This red phosphor particle is obtained by activating titanate represented by general formula: M2TiO4(wherein M is one or more alkaline earth metal element) with Mn. The red phosphor particle has: a spherical shape that is composed of a plurality of coalescent primary particles; and a surface state in which no grain boundary is observed between primary particles when observed with an electron microscope at a magnification of 3,000 times. The red phosphor particle is suitably produced by: preparing a liquid mixture in which an alkaline earth metal source, a manganese source and a titanium source are mixed with a dispersion medium; wet-mixing the liquid mixture using a media mill; making the liquid mixture into a dry powder by a spray dry method; firing the dry powder to prepare a fired product; followed by annealing the fired product.

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