To combat environmental issues, 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 global energy generation. There is a large room for improving energy utilization of lighting. However, the scientific challenge is to reach simultaneously high-quality photometric performance.1 To address these and related problems2, we develop and demonstrate new classes of color-conversion LEDs integrating nanophosphors of semiconductor quantum dots for high-photometric quality3 and those enhanced using excitonics (controlling exciton-exciton interactions) through F�rster-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/Wopt 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 for color-conversion LEDs7 and large-area sheets of such nanocrystals for remote phosphor applications8. We work on new integration strategies9 of these nanophosphor quantum dots and also those on LEDs using smart peptide linkers.10References: 1 H.V.Demir, et al., Nano Today 6, 632 (2011).2 T.Erdem and H.V.Demir, Nature Photonics 5, 126 (2011).3 S.Nizamoglu et al., Applied Physics Letters 92, 031102 (2008).4 S.Nizamoglu and H.V.Demir, Applied Physics Letters 95, 151111 (2009).5 T.Erdem et al., Optics Express 20, 3275 (2012).6 S.Nizamoglu et al., Optics Letters 35, 20, 3372-3374 (2010).7 X.Yang et al., Advanced Materials 24 , 4180�4185 (2012).8 E.Mutlug�n et al., Nano Letters 12, 3986 (2012).9 U.O.S.Seker et al., Nano Letters 11, 1530 (2011).10 H. V. Demir et al., ACS Nano 5, 2735 (2011).

Nanocrystal optoelectronics for quality lighting and displays

246th National Meeting (2013)

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