Patent ID: 8217406

Claim:
A solid state light emitting device, comprising: a semiconductor chip for producing electromagnetic energy in a range of 380-420 nm; a package enclosing the semiconductor chip and configured to allow emission of light as an output of the device; at least one reflective surface within the package forming an optical integrating cavity, wherein the semiconductor chip is positioned and oriented so that at least substantially all direct emissions from the semiconductor chip reflect at least once within the cavity; a light transmissive solid filling at least a substantial portion of the optical integrating cavity, wherein a surface of the light transmissive solid forms an optical aperture of the optical integrating cavity; a plurality of doped semiconductor nanophosphors within the package enclosing the semiconductor chip, each of the doped semiconductor nanophosphors: including nanocrystals formed of semiconductor materials which are doped with an impurity, being excited in response to electromagnetic energy in the range of 380-420 nm for re-emitting visible light of a different spectrum having substantially no overlap with absorption spectra of the doped semiconductor nanophosphors, and for together producing visible light in the output of the device when the doped semiconductor nanophosphors are excited by electromagnetic energy from the semiconductor chip, wherein: (a) the visible light output produced during the excitation of the doped semiconductor nanophosphors is at least substantially white; (b) the visible light output produced during the excitation of the doped semiconductor nanophosphors has a color rendering index (CRI) of 75 or higher; and (c) the visible light output produced during the excitation of the doped semiconductor nanophosphors has a color temperature in one of the following ranges: 2,725±145° Kelvin; 3,045±175° Kelvin; 3,465±245° Kelvin; 3,985±275° Kelvin; 4,503±243° Kelvin; 5,028±283° Kelvin; 5,665±355° Kelvin; and 6,530±510° Kelvin, the semiconductor chip is positioned and oriented relative to the light transmissive solid so that any electromagnetic energy reaching the optical aperture surface of the light transmissive solid directly from the semiconductor chip impacts the optical aperture surface at a sufficiently small angle as to be reflected back into the optical integrating cavity by total internal reflection at the optical aperture surface of the light transmissive solid.