Patent ID: 11959632
Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC C  F  A  H | IPC A  F

Claim 14:
15. A light-emitting device comprising:
a light source that radiates a primary light; and
a first phosphor that absorbs the primary light and converts the primary light into a first wavelength-converted light having a longer wavelength than the primary light, wherein:
the primary light is a laser light,
the first wavelength-converted light includes fluorescence based on electron energy transition of Cr3+, the fluorescence having an afterglow of more than 10 μs based on a parity-forbidden transition,
an 80% spectrum width in a maximum fluorescence intensity value peak of the first wavelength-converted light is 20 nm or more and less than 80 nm, and, the light source is a solid-state light-emitting element with a rated light output of 1 W or more, wherein saturation of the fluorescence based on the parity-forbidden transition of Cr3+ is less likely to occur under excitation by the primary light relative to saturation of fluorescence based on a parity-allowed transition of Ce3+ or Eu2+ having an afterglow of 10 μs or less.