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US 8,427,041 B2Granted
Warm white LED and its lutetium-based phosphor
OwnerChi-Ruei Tsai, Kun-Lin Chang +2inventors
InventorsChi-Ruei Tsai, Kun-Lin Chang, Chen-Pei Hsu, Wen-Sheng Huang
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Abstract
A lutetium-based phosphor having the chemical formula: xLu3Al5O12.yGd3Al5O12:CePrEuTb, and being capable of radiating reddish orange-red spectrum when activated by a shortwave light emitted by an InGaN light-emitting diode. The invention also discloses a warm white LED using the lutetium-based phosphor that produces orange-red light having the peak wavelength λmax>560 nm, half width>125 nm and color rendering index Ra≧75 when activated by the LED radiation λ=420˜500 nm.
Claims9
A lutetium-based phosphor comprising:
- a chemical formula:
- xLu3Al5O12.yGd3Al5O12:CePrEuTb, and being capable of radiating an orange-red spectrum when activated by a shortwave light emitted by an InGaN light-emitting diode, the lutetium-based phosphor includes at least one activator, wherein x+y=1 and 0<x<1.
A warm white light-emitting diode comprising:
- an InGaN light-emitting diode, and a light conversion layer located on a top side of said InGaN light-emitting diode and adapted for converting a primary blue radiation of said InGaN light-emitting diode into warm white light, wherein said light conversion layer comprising a lutetium-based phosphor having a chemical formula of xLu3Al5O12.yGd3Al5O12:CePrEuTb and is joined with an organic silicon polymer and evenly distributed over a radiating surface and facets of said InGaN light-emitting diode, the lutetium-based phosphor includes at least one activator, wherein x+y=1 and 0<x<1.
Dependencies are inferred from the claim text.