FLUORESCENT MATERIAL HAVING COMPOSITION OF RARE EARTH ALUMINUM-GALLATE, AND LIGHT EMITTING DEVICE

文件类型：PDF文档
文件大小：504K
Provided are a fluorescent material having a composition of a rare earth aluminum-gallate having a high light emission intensity, and a light emitting device using the fluorescent material. The fluorescent material has a composition of a rare earth aluminum gallate containing at least one rare earth element Ln selected from the group consisting of Y, Gd, La, Lu, Sc and Sm; at least one Group 13 element selected from Al and Ga; Tb; Ce; and Eu. When a total molar composition ratio 5 of Al and Ga is used as a basis, a total molar ratio of Ln, and Tb, Ce and Eu is 3, a molar ratio of Tb is a product of 3 and a value of a parameter a, a molar ratio of Ce is a product of 3 and a value of a parameter b, a molar ratio of Eu is a product of 3 and a value of a parameter c, a molar ratio of Ga is a product of 5 and a value of a parameter d, the parameter a is 0.25 or more and less than 1, the parameter b is 0.008 × 10-2 or more and 1.5 × 10-2 or less, the parameter c is 0.012 × 10-2 or more and 2 × 10-2 or less, and the parameter d is 0 or more and 0.85 or less.