Patent number: 10214689
Abstract: Provided are a fluorescent material including a high light emission intensity and a light emitting device using the same. The present fluorescent material includes at least an A element, a M element, a D element, a E element, and an X element, wherein the A element is at least one element selected from the group consisting of Sr, Mg, Ca, and Ba; the M element is at least one element selected from the group consisting of Eu, Mn, Ce, Pr, Nd, Sm, Tb, Dy, and Yb; the D element is at least one element selected from the group consisting of Si, Ge, Sn, Ti, Zr, and Hf, the E element is at least one element selected from the group consisting of Al, B, Ga, In, Sc, Y, and La; the X element is at least one element selected from the group consisting of O, N, and F; and a molar ratio of the M element to the sum of the A element and the M element [M/(A+M)] is 0.06 or less.
Type:
Grant
Filed:
December 15, 2017
Date of Patent:
February 26, 2019
Assignees:
NATIONAL INSTITUTE FOR MATERIALS SCIENCE, NICHIA CORPORATION
Inventors:
Naoto Hirosaki, Takashi Takeda, Shiro Funahashi, Takayuki Shinohara, Shoji Hosokawa