White light emitting device
AssigneeToyoda Gosei Co., Ltd.
InventorsTakemasa Yasukawa, Shota Shimonishi, Koichi Ota
Life of this patent
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Abstract
A purple LED is fixed onto lead frames in the cup of a frame using a mount, and the purple LED is sealed by filling a sealant of transparent resin into the cup. Red/green/blue phosphors that absorb a light emitted by the purple LED and emit lights having red, green, blue wavelengths different from the wavelength of this absorbed light are mixed into the sealant. A yellow phosphor that absorbs a light emitted by the purple LED and emits a light having a yellow wavelength different from the wavelength of this absorbed light is additionally mixed into the sealant in such a white light emitting device.
Claims18
A white light emitting device, comprising:
- a light emitting element comprising a peak wavelength of 500 nm or less;
- a first phosphor to absorb a light emitted from the light emitting element and to emit a light comprising a yellow wavelength different from a wavelength of the light absorbed;
- and
- a second phosphor comprising an emission wavelength different from at least that of the first phosphor, wherein the first phosphor comprises an alkaline earth metal silicate.
A white light emitting device;
- comprising:
- a light emitting element comprising a GaN-based semiconductor and emitting a purple light which is disposed in a cup of a mount lead;
- a sealant made of a transparent resin filled in the cup and sealing the light emitting element;
- and
- red, green, and blue phosphors absorbing a light emitted from the light emitting element and emitting red, green, and blue lights of wavelengths different from that of the light absorbed, respectively, and a yellow phosphor absorbing a light emitted from the light emitting element and emitting a yellow light of a wavelength different from that of the light absorbed being mixed into the sealant.
A white light emitting device, comprising:
- a light emitting element made of a GaN-based semiconductor and emitting a purple light which is disposed in a cup of a mount lead;
- a sealant made of a transparent resin filled in the cup and sealing the light emitting element;
- a lens-shaped mold member made of a transparent resin and covering the cup filled with the sealant and a part of the mount lead;
- and
- a fluorescence cover fitted to the mold member and to which red, green, and blue phosphors absorbing a light emitted from the light emitting element and emitting red, green, and blue lights of wavelengths different from that of the light absorbed, respectively, are mixed into;
- a yellow phosphor absorbing a light emitted from the light emitting element and emitting a yellow light of a wavelength different from that of the light absorbed is mixed into the fluorescence cover.
A white light emitting device, comprising:
- a light emitting element emitting a purple light;
- a substantially rectangular light guidance plate guiding a light emitted from the light emitting element to outgo the light from a light-outgoing surface;
- and
- red, green, and blue phosphors absorbing a light emitted from the light emitting element and emitting red, green, and blue lights of wavelengths different from that of the light absorbed, respectively, and a yellow phosphor absorbing a light emitted from the light emitting element and emitting a yellow light of a wavelength different from that of the light absorbed being applied onto the light-outgoing surface of the light guidance plate.
A white light emitting device, comprising:
- a light emitting element emitting a purple light;
- a substantially rectangular light guidance plate guiding a light emitted from the light emitting element to outgo the light from a light-outgoing surface;
- and
- a film to which red, green, and blue phosphors absorbing a light emitted from the light emitting element and emitting red, green, and blue lights of wavelengths different from that of the light absorbed, respectively, are mixed into;
- a yellow phosphor absorbing a light emitted from the light emitting element and emitting a yellow light of a wavelength different from that of the light absorbed being mixed into the film.
Dependencies are inferred from the claim text.