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US 6,717,355 B2Granted
Light-emitting unit
AssigneeToyoda Gosei Co., Ltd.
InventorsYuji Takahashi, Koichi Kaga, Koichi Ota, Akihito Ota
Life of this patent
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Abstract
A light-emitting device with an emission wavelength range of from 360 nm to 550 nm and a fluorescent material made of Ca—Al—Si—O—N oxynitride activated with Eu2+ are used so that a part of light emitted from the light-emitting device is emitted while the wavelength of the part of light is converted by the fluorescent material.
Claims37
A light-emitting unit comprising:
- a light-emitting device for emitting light with a wavelength range of from 360 nm to 550 nm;
- and
- a fluorescent material comprising Ca—Al—Si—O—N oxynitride activated with Eu2+,
- wherein at least a part of said light emitted from said light-emitting device is subjected to wavelength conversion by said fluorescent material.
1 more element
A light-emitting method comprising:
- irradiating a fluorescent material made of Ca—Al—Si—O—N oxynitride activated with Eu2+ with light emitted from a light-emitting device with an emission wavelength range of from 360 nm to 550 nm to thereby convert the wavelength of a part of said light;
- and
- mixing said part of said light with the converted wavelength with the other part of said light emitted from said light-emitting device to thereby emit resultant light,
- wherein said light-emitting device is turned on intermittently.
1 more element
A fluorescent material for a light-emitting unit, said material comprising Ca—Al—Si—O—N oxynitride activated with Eu2+.
Dependencies are inferred from the claim text.