US 12,287,089 B2
Light emitting device
Kenta Niki, Tokushima (JP); and Jun Takahashi, Inagi (JP)
Assigned to NICHIA CORPORATION, Anan (JP)
Filed by NICHIA CORPORATION, Anan (JP)
Filed on Jan. 26, 2023, as Appl. No. 18/159,962.
Application 18/159,962 is a continuation of application No. 17/305,124, filed on Jun. 30, 2021, granted, now 11,598,508.
Claims priority of application No. 2020-113376 (JP), filed on Jun. 30, 2020.
Prior Publication US 2023/0243485 A1, Aug. 3, 2023
Int. Cl. F21V 9/45 (2018.01); H05B 45/20 (2020.01)
CPC F21V 9/45 (2018.02) [H05B 45/20 (2020.01)] 13 Claims
OG exemplary drawing
 
1. A light emitting device,
comprising one or a plurality of light emitting elements and a plurality of fluorescent materials;
emitting
two or more single lights including at least a first single light and a third single light among the first single light, a second single light, and the third single light;
wherein the first single light is a light emitted from one or a plurality of light emitting elements, and one or a plurality of fluorescent materials including a fluoride fluorescent material having a light emission peak in the vicinity of 630 nm among one or a plurality of the light emitting elements and a plurality of the fluorescent materials; and
the first single light has a first color temperature with a correlated color temperature in a range of 1,500 K or more and 3,500 K or less, and a color rendering index R9 of 50 or more;
wherein the second single light is a light emitted from one or a plurality of light emitting elements, and one or a plurality of fluorescent materials including a fluoride fluorescent material having a light emission peak in the vicinity of 630 nm among one or a plurality of the light emitting elements and a plurality of the fluorescent materials; and
the second single light has a second color temperature with a correlated color temperature in a range of 3,500 K or more and 5,500 K or less that is higher than the first color temperature, and a color rendering index R9 of 50 or more;
wherein the third single light is a light emitted from one or a plurality of light emitting elements, and one or a plurality of fluorescent materials including fluorescent materials different from one or a plurality of the fluorescent materials contained in at least the first single light; and
the third single light has values of X and Y coordinates in the chromaticity diagram of the CIE1931 color system that are smaller than the values of X and Y coordinates at a color temperature of 5,500 K on the black body radiation locus, and a value of melanopic ratio of 1.80 or more;
wherein a light having a correlated color temperature of 6,500 K composed of two or more lights including at least the first single light and the third single light among the first single light, the second single light, and the third single light, has a value of melanopic ratio of 1.0 or more, and a color rendering index R9 of 50 or more at a correlated color temperature at least in a range of 3500 K or more and 5000 K or less.