公开(公告)号：US11450790B2

公开(公告)日：2022-09-20

申请号：US16833552

申请日：2020-03-28

Applicant: NICHIA CORPORATION

Inventor： Chihiro Yamada ,  Daisuke Iwakura

IPC: H01L33/50 ,  H01L33/62 ,  H01L33/60 ,  H01L33/32 ,  H01L33/48 ,  H01L33/56 ,  C09K11/66 ,  C09K11/77 ,  C09K11/08

Abstract: The red light-emitting device includes a light source, a first layer covering at least a portion of the light source and containing a fluoride phosphor converting light emitted from the light source, and a second layer covering at least a portion of the first layer and containing a nitride phosphor converting light emitted from the light source and/or the first layer. An emission intensity ratio at an emission peak wavelength of the light source is greater than 0 and 0.1 or less, and the emission intensity ratio at the wavelength of the maximum emission peak in an emission spectrum of the light-emitting device is greater than 2.8, supposing the reference emission intensity that is the minimum emission intensity within the range of plus or minus 15 nm or 30 nm from the wavelength of the maximum emission peak in the emission spectrum of the light-emitting device is 1.

公开(公告)号：US11489093B2

公开(公告)日：2022-11-01

申请号：US16942983

申请日：2020-07-30

Applicant: NICHIA CORPORATION

Inventor： Chihiro Yamada ,  Daisuke Iwakura

IPC: H01L33/50 ,  H04N5/33 ,  H04N5/225 ,  H01L33/00

Abstract: A illumination device comprises an excitation light source, a first fluorescent material that converts the wavelength of light emitted from the excitation light source and emits light having a light emission peak wavelength in a range of 780 nm or more and 1,600 nm or less, and a cut filter that blocks light in a wavelength range of 870 nm or less, wherein the first fluorescent material contains a fluorescent material having a composition of rare earth aluminate containing Ce and Nd.