| abstract |
Disclosed is a phosphor having high luminance, which is composed of M 1 , M 2 , M 3 , M 4 , a halogen element and O, wherein M 1 represents an alkaline earth metal; M 2 represents a trivalent metal element; M 3 represents an activating element; and M 4 represents a tetravalent metal element, with the molar ratio among M 1 , (M 2 +M 3 ), M 4 , and the halogen element, namely M 1 :(M 2 +M 3 ):M 4 : halogen element being 1:4:3:a wherein a is a number within the range of not less than 0.01 but not more than 3. The phosphor can be obtained by firing a metal compound mixture containing M 1 , M 2 , M 3 , M 4 , and a halogen element, wherein M 1 , M 2 , M 3 and M 4 are as defined above, which additionally contains one or more halides selected from the group consisting of halides of M 1 , halides of M 2 and halides of M 3 . |