WHITE LIGHT SOURCE INCLUDING LED AND PHOSPHORS
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United States of America Patent
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Issued Date -
May 25, 2023
app pub date -
Jan 20, 2023
filing date -
May 20, 2016
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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.
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