Light-emitting device, electronic device, and method for using light-emitting device

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.

A light-emitting device comprising:

• a light source that radiates primary light;
• and
• a first phosphor that absorbs the primary light and converts the primary light into first wavelength-converted light having a longer wavelength than the primary light, wherein:
• the primary light is 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,
• a ratio of a fluorescence intensity of a fluorescence spectrum of the first wavelength-converted light at a wavelength of 780 nm with respect to a maximum fluorescence intensity value of the first wavelength-converted light exceeds 30%, 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.

A light-emitting device comprising:

• a light source that radiates primary light;
• and
• a first phosphor that absorbs the primary light and converts the primary light into first wavelength-converted light having a longer wavelength than the primary light, wherein:
• the primary light is 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, and
• a 1/10 afterglow of the first wavelength-converted light is less than 1 ms, 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.