Patent ID: 7834372
Filing Date: 2010-11-16
Classification: F21V,F21Y

Abstract:
1. A solid state lighting device comprising: a first group of semiconductor light emitting components emitting a first spectrum of primary light, said first group of semiconductor light emitting components emitting a near-UV primary light having a peak wavelength range from about 380 nm to 420 nm; a first wavelength down-conversion layer on top of said first group of semiconductor light emitting components exciting a second spectrum of yellow light having a narrow bandwidth, said first wavelength down-conversion layer comprising a mixture of blue quantum dots, and yellow quantum dots, said first wavelength down-conversion layer exciting a blue spectrum of light having a peak wavelength from about 440 nm to 465 nm, and a yellow spectrum of light having a peak wavelength from about 550 nm to 575 nm and a narrow bandwidth with full width at half maximum less than 75 nm; a second wavelength down-conversion layer on top of said first wavelength down-conversion layer exciting a third spectrum of light having a peak wavelength between said first spectrum of primary light and said second spectrum of yellow light; a second group of semiconductor light emitting components emitting a fourth spectrum of light having a peak wavelength longer than said first spectrum of primary light and said second spectrum of yellow light; a color mixing cavity having a diffusive output window mixing said first spectrum of primary light, said second spectrum of yellow light, said third spectrum of light and said fourth spectrum of light; a light recycling reflector member around an interior wall of said solid state lighting device, said light recycling reflector member surrounding said first group of semiconductor light emitting components and said second group of semiconductor light emitting components; and a power line electrically connected to said first group of semiconductor light emitting components and said second group of semiconductor light emitting components.