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US 12,245,445 B2Granted
White light source including LED and phosphors
AssigneeSeoul Semiconductor Co., Ltd.
InventorsTatsunori Itoga, Ryoji Tsuda, Naotoshi Matsuda, Yoshitaka Funayama
Life of this patent
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Abstract
According to one embodiment, a white light source includes a combination of a light emitting diode and phosphors. One of the phosphors is at least a cerium activated yttrium aluminum garnet-based phosphor. There is no light emission spectrum peak at which a ratio of a largest maximum value to a minimum value is greater than 1.9. The largest maximum value is largest among at least one maximum value present in a wavelength range of 400 nm to 500 nm in a light emission spectrum of white light emitted from the white light source. The minimum value is adjacent to the largest maximum value in a longer wavelength side of the light emission spectrum.
Claims20
A lighting device, comprising:
- a substrate including a circuit;
- a light emitting diode disposed on the substrate;
- and
- a wavelength conversion layer disposed on the light emitting diode and comprising a plurality of wavelength converters,
- wherein a light generated by mixing light emitted from the light emitting diode and the plurality of wavelength converters is a white light,
- wherein the white light has no light emission spectrum peak that has a ratio of a largest maximum value to a minimum value of greater than 1.9,
- wherein the ratio is defined by a light emission spectrum intensity in a wavelength that indicates the largest maximum value divided by a light emission spectrum intensity in a wavelength that indicates the minimum value,
- wherein the largest maximum value is a largest value among at least one maximum light emission spectrum intensity value present in a wavelength range of 400 nm to 500 nm in a light emission spectrum of the white light,
- wherein the minimum value is a light emission intensity value having a minimum value and being adjacent to the largest maximum value in a longer wavelength side of the light emission spectrum,
- wherein each of the plurality of wavelength converters includes a particle size with a range of 10 μm or longer and 50 μm or shorter,
- wherein the white light has a color temperature with a range of 2500 K to 6500 K, and
- wherein a light emission spectrum peak at a color temperature below 3000K has a first ratio of a largest maximum value to a minimum value that is different from a second ratio of a largest maximum value to a minimum value of a light emission spectrum peak at a color temperature of about 5000K.
9 more elements
A lighting device, comprising:
- a substrate including a circuit;
- a light emitter disposed on the substrate and configured to emit a first light;
- and
- a wavelength conversion layer disposed on the light emitter and configured to emit a second light and a third light,
- wherein a light emitted from the lighting device comprises the first light, the second light, and the third light,
- wherein the light emitted from the lighting device has no light emission spectrum peak that has a ratio of a largest maximum value to a minimum value of greater than 1.9,
- wherein the ratio is defined by a light emission spectrum intensity in a wavelength that indicates the largest maximum value divided by a light emission spectrum intensity in a wavelength that indicates the minimum value,
- wherein the largest maximum value is a largest value among at least one maximum light emission spectrum intensity value present in a wavelength range of 400 nm to 500 nm in a light emission spectrum of the light,
- wherein the minimum value is a light emission intensity value having a minimum value and being adjacent to the largest maximum value in a longer wavelength side of the light emission spectrum,
- wherein the first light has a wavelength range of 400 nm to 500 nm,
- wherein at least one of color rendering indices R1 to R8 of the light is set to 85 or larger, and
- wherein a light emission spectrum peak at a color temperature below 3000K has a first ratio of a largest maximum value to a minimum value that is different from a second ratio of a largest maximum value to a minimum value of a light emission spectrum peak at a color temperature of about 5000K.
9 more elements
A lighting device, comprising:
- a substrate including a circuit;
- a light emitter disposed on the substrate and configured to emit a first light;
- and
- a wavelength conversion layer disposed on the light emitter and configured to emit a second light and a third light,
- wherein a light emitted from the lighting device comprises the first light, the second light, and the third light,
- wherein the light emitted from the lighting device has no light emission spectrum peak that has a ratio of a largest maximum value to a minimum value of greater than 1.9,
- wherein the ratio is defined by a light emission spectrum intensity in a wavelength that indicates the largest maximum value divided by a light emission spectrum intensity in a wavelength that indicates the minimum value,
- wherein the largest maximum value is a largest value among at least one maximum light emission spectrum intensity value present in a wavelength range of 400 nm to 500 nm in a light emission spectrum of the light,
- wherein the minimum value is a light emission intensity value having a minimum value and being adjacent to the largest maximum value in a longer wavelength side of the light emission spectrum,
- wherein the first light has in a wavelength range of 400 nm to 500 nm,
- wherein the light has a color temperature with a range of 2500 K to 6500 K, and
- wherein a light emission spectrum peak at a color temperature below 3000K has a first ratio of a largest maximum value to a minimum value that is different from a second ratio of a largest maximum value to a minimum value of a light emission spectrum peak at a color temperature of about 5000K.
9 more elements
Dependencies are inferred from the claim text.