To provide a light emitting device that emits white-based light by using red-, green- and blue-emitting phosphors, which emits light in high luminance and to obtain a red-emitting phosphor that is suitable for such a light emitting device and emits light in high luminous efficiency and in high luminance.
The red-emitting phosphor is dispersed into the sealing material of a light emitting device in which a semiconductor light-emitting element emitting light at 350-420 nm wavelength is sealed in the sealing material. A red-emitting phosphor particle emitting red light and having 40-200 μm average particle diameter, which contains an Eu ion that directly absorbs light at 350-420 nm wavelength emitted from the semiconductor light-emitting element, is used as the red-emitting phosphor that is added to a fluorescent layer arranged at an optical path of light emitted from the semiconductor light emitting device. The red-emitting phosphor particle exhibits high emission intensity at about 400 nm wavelength in a nonconventionally high luminous efficiency. The light emitting device that emits white or neutral color in a delicate color more precisely in good reproducibility and in higher luminance is obtained by using the red-emitting phosphor especially with a green-emitting phosphor and a blue-emitting phosphor in a light emitting device showing white or neutral color.
TAKANO TSUTOMU
| JP2003041252A | 2003-02-13 | |||
| JP2004231770A | 2004-08-19 | |||
| JP2004359842A | 2004-12-24 | |||
| JP2005008843A | 2005-01-13 |
Saori Shigematsu
Katsunari Kobayashi
Takeshi Ishikawa
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