Light emitting device and light source
AssigneeNichia Corporation
InventorsTaiki YUASA, Masaki HAYASHI
Life of this patent
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Abstract
A light emitting device includes at least one light emitting element to emit a first light having a first peak emission wavelength in a range of 420 nm to 480 nm and at least one fluorescent material to convert the first light to a second light having a second fluorescent peak wavelength in a range of 610 nm to 750 nm. The second light has chromaticity existing in an enclosed area in a CIE 1931 chromaticity diagram in which chromaticity is defined by x and y coordinates. The enclosed area is enclosed with a first straight line, a second straight line, a third straight line, and a curved line.
Claims12
A light emitting device comprising:
- at least one first light emitting element to emit a first light having a first peak emission wavelength in a range of 420 nm or greater and 480 nm or less;
- and
- at least one fluorescent material to convert the first light to a second light having a second peak emission wavelength in a range of 610 nm or greater and 750 nm or less, the second light having chromaticity existing in an enclosed area in a CIE 1931 chromaticity diagram in which chromaticity is defined by x and y coordinates, the enclosed area being enclosed with a first straight line, a second straight line, a third straight line, and a curved line, the first straight line connecting a first point at which x is equal to 0.666 and y is equal to 0.334 and a second point at which x is equal to 0.643 and y is equal to 0.334, the second straight line connecting the second point and a third point at which x is equal to 0.576 and y is equal to 0.291, the third straight line connecting the third point and a fourth point at which x is equal to 0.737 and y is equal to 0.263, the curved line connecting the fourth point and the first point.
Dependencies are inferred from the claim text.