Patent ID: 8704440
Filing Date: 2014-04-22
Classification: C09K,H01L

Abstract:
1. An LED lighting device comprising: at least one LED die and a phosphor composition; the at least one LED die emitting a blue light that excites the phosphor composition, the blue light having an excitation dominant wavelength in a range from 440 nm to 470 nm; the phosphor composition having an emission dominant wavelength responsive to the excitation dominant wavelength, the phosphor composition comprising a first phosphor, a second phosphor and a third phosphor, the phosphor composition having a first weight ratio of the first phosphor and the second phosphor, and a second weight ratio of the second phosphor and the third phosphor, the first and second weight ratios being arranged so that the emission dominant wavelength of the phosphor composition increases as the excitation dominant wavelength increases; and the LED lighting device having an output light, the first and second weight ratios being further arranged so that the output light exhibits a substantially stabilized chromaticity and a substantially stabilized color temperature in response to variations in the excitation dominate wavelength within the range.