| To combat environmental issues escalating with the increasing carbon footprint, combined with the energy problem of limited resources, innovating fundamentally new ways of raising energy efficiency is essential to our energy future. Today achieving lighting efficiency is an important key because artificial lighting consumes about 19% of total energy generation around the globe. There is a large room for improving energy utilization of lighting for potential emission reduction. However, the scientific challenge is to reach simultaneously high-quality photometric performance. To address these and related problems, we develop and demonstrate new classes of color-conversion LEDs integrating nanophosphors of semiconductor quantum dots for high-photometric quality and those enhanced using excitonics (controlling exciton-exciton interactions) through Förster-type nonradiative energy transfer (NRET). We study intrinsic performance limits and fundamental photometric tradeoffs of such narrow-emitter nanophosphors investigating a large scale (>200M) of designs. We showed that it is possible to achieve high levels of photometric performance with a luminous efficacy of optical radiation >380 lm/Wopt and a color-rendering index >90 in the warm-white region, important for spectrally high-efficiency, high-quality lighting. We work on new integration strategies of these nanophosphor quantum dots and also those on LEDs using smart peptide linkers. |
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