Quality LED lighting and displays using nanocrystals

Today lighting efficiency and quality are essential to wide-scale utilization of semiconductor lighting technologies. To address these challenges, we develop and demonstrate new classes of color-conversion LEDs^1,2 integrating nanophosphors of semiconductor quantum dots for high-photometric quality³ and those enhanced using excitonics (controlling exciton-exciton interactions) through Förster-type nonradiative energy transfer (NRET)⁴. We study intrinsic performance limits and fundamental photometric tradeoffs of such narrow-emitter nanophosphors investigating a large scale (>200M) of designs.⁵ We show that it is possible to achieve high levels of photometric performance with a luminous efficacy of optical radiation >380 lm/W_opt and a color-rendering index >90 in the warm-white region, important for spectrally high-efficiency, high-quality lighting.⁶ We show eco-friendly nanocrystals tuned across the visible⁷ and large-area sheets of such nanocrystals for remote phosphor applications⁸.