Red fluorescent material, method for producing red fluorescent material, white light source, illuminating device, and liquid crystal display

A method for producing a red fluorescent material, comprising

• mixing a carbonate compound of an element A, europium nitride, silicon nitride, and melamine to form a mixture so that the element A, europium (Eu), silicon (Si), carbon (C), oxygen (O), and nitrogen (N) are contained at an atomic ratio of the following composition formula (1),
• [A(m-x)Eux][Si(9-y)Cy]OnN[12-2(n-m)/3 ]
• wherein the element A is a group 2 element including at least calcium (Ca) and strontium (Sr);
• and
• m, x, y, and n satisfy 3<m<5, 0<x<1, 0<y<9, and 0<n<10, respectively;
• burning the mixture to form a burned material;
• and
• pulverizing the burned material.

A white light source, comprising:

• a blue light-emitting diode formed on an element substrate;
• and
• a kneaded material which is obtained by kneading a red phosphor and a green phosphor with a transparent resin and is arranged on the blue light-emitting diode,
• the red phosphor containing
• an element A, europium (Eu), silicon (Si), carbon (C), oxygen (O), and nitrogen (N) at an atomic ratio of the following composition formula (1):
• [A(m-x)Eux][Si(9-y)Cy]OnN[12-2(n-m)/3] Composition Formula (1)
• wherein the element A is a group 2 element including at least calcium (Ca) and strontium (Sr);
• and
• m, x, y, and n satisfy 3<m<5, 0<x<1, 0<y<9, and 0<n<10, respectively.