Patent ID: 9293668
Filing Date: 2016-03-22
CPC Classification: H01L

Claim Text:
1. A phosphor-converted single-color LED comprising: a blue light source; a phosphor disposed on the blue light source to absorb blue light emitted from the blue light source and emit light at a wavelength of 500 to 700 nm; and a long-wavelength pass filter disposed on the phosphor to reflect blue light and transmit light at a wavelength of 500 to 700 nm, wherein the long-wavelength pass filter comprises a layer stack comprising first thin films and second thin films laminated alternately and repeatedly, the second thin films having a refractive index higher than that of the first thin films, wherein an uppermost layer and a lowermost layer are formed on and under the layer stack, respectively, and wherein the thickness of each of the uppermost layer and the lowermost layer is 1/80 to 1/4.4 of the optical thickness corresponding to the peak wavelength of the reflection band of the blue light in order to increase transmittance of the long-wavelength pass filter at a wavelength of 500 to 700 nm.