RED FLUORESCENT MATERIAL, METHOD FOR PRODUCING RED FLUORESCENT MATERIAL, WHITE LIGHT SOURCE, ILLUMINATING DEVICE, AND LIQUID CRYSTAL DISPLAY

摘要

[Problems to Be Solved];The present invention provides an efficient red fluorescent material and a method for producing the same, provides a white light source and an illuminating device each of which uses this red fluorescent material to achieve snow-white lighting, and furthermore provides a liquid crystal display having excellent color reproduction.;[Means to Solve the Problem];The red fluorescent material contains an element A, europium (Eu), silicon (Si), carbon (C), oxygen (O), and nitrogen (N), at an atomic ratio of the following composition formula (1).; [Chemical Formula 1]; [A_(m-x)Eu_x][Si_(9-y)C_y]O_nN_{[12-2(n-m)/3]}  Composition Formula (1);Note that, in the composition formula (1), the element A is a group 2 element including at least calcium (Ca) and strontium (Sr). Also, note that, in the composition formula (1), m, x, y, and n satisfy 3m5, 0x1, 0y9, and 0n10, respectively.;Such red fluorescent material is able to improve quantum efficiency, compared with a red fluorescent material which does not contain calcium (Ca) but contains strontium (Sr) as the element A.