Light-emitting device
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsShozo Oshio, Takeshi Abe
Life of this patent
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Abstract
A light-emitting device 1 includes: a solid-state light-emitting element 10 that radiates a laser beam L; and a wavelength converter 50 including a plurality of types of phosphors which receive the laser beam L and radiate light. The phosphors 50 included in the wavelength converter are substantially composed of a Ce3+-activated phosphor. Then, output light of the light-emitting device 1 has a light component across a wavelength range of at least 420 nm or more and less than 700 nm. The light-emitting device 1 is capable of radiating light with high color rendering properties over a wide wavelength range.
Claims20
A light-emitting device comprising:
- a solid-state light-emitting element that radiates a laser beam having a maximum intensity value within a wavelength range of 380 nm or more and less than 420 nm;
- and
- a wavelength converter that includes a plurality of types of phosphors which receive the laser beam and radiate light,
- wherein the phosphors included in the wavelength converter are substantially composed of a Ce3+-activated phosphor,
- wherein the plurality of types of phosphors include:
- a first phosphor that emits first fluorescence having a maximum intensity value within a wavelength range of 435 nm or more and less than 500 nm;
- and a second phosphor that emits second fluorescence having a maximum intensity value within a wavelength range of 580 nm or more and less than 630 nm,
- wherein the first phosphor is excited by the laser beam, and the second phosphor is excited by at least fluorescence emitted by the first phosphor, and
- wherein output light has a light component across a wavelength range of at least 420 nm or more and less than 700 nm.
Dependencies are inferred from the claim text.