Patent ID: 8749130

Claim:
A down converting nanocomposite device, comprising (a) a blue light emitting diode (LED) excitation source; (b) a phosphor layer comprising red and green semiconductor nanocrystal phosphors of different sizes optically coupled to said blue LED excitation source, said nanocrystal phosphors emitting light at different selected wavelengths, the combination of blue light from said LED source and said light emitted from said phosphors producing white light and providing a CRI of greater than about 80; (c) a matrix comprising a polymer; and (d) a ligand composition attached to the nanocrystals to allow for mixing of the nanocrystals within the polymer which ligand composition is not used to form the polymer, wherein the nanocrystals with ligand composition attached thereto are embedded within said matrix, the ligand composition comprising a body structure, a head group comprising at least one amine chemically coupled to the nanocrystals and to the body structure at a first position on the body structure, and a tail group chemically coupled to the body structure at a second position on the body structure; where the tail group comprises a hydroxyl group or a silane group.