Colloidal nanocrystal layers deposited onto the enclosure of InGaN light emitting diodes are demonstrated to operate as
nano-phosphors for color conversion with high color stability. Dependent on the choice of the nanocrystal materials,
either CdSe/ZnS or PbS nanocrystals are applied, the diode emission at 470 nm is converted to the red or to infrared
light, with similar quantum efficiencies. The color conversion is further improved by dielectric mirrors with high
reflectivity at the emission band of the nanocrystals, resulting in an almost doubling of the nanocrystal light extraction from the devices, which increases the nanocrystal device efficiency up to 19.1%.