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Perovskite energy funnels for efficient light-emitting diodes

Title
Perovskite energy funnels for efficient light-emitting diodes
Authors
Yuan, MingjianLi Na QuanComin, RiccardoWalters, GrantSabatini, RandyVoznyy, OleksandrHoogland, SjoerdZhao, YongbiaoBeauregard, Eric M.Kanjanaboos, PongsakornLu, ZhenghongKim, Dong HaSargent, Edward H.
Ewha Authors
김동하
SCOPUS Author ID
김동하scopus
Issue Date
2016
Journal Title
NATURE NANOTECHNOLOGY
ISSN
1748-3387JCR Link1748-3395JCR Link
Citation
vol. 11, no. 10, pp. 872 - +
Publisher
NATURE PUBLISHING GROUP
Indexed
SCI; SCIE; SCOPUS WOS
Abstract
Organometal halide perovskites exhibit large bulk crystal domain sizes, rare traps, excellent mobilities and carriers that are free at room temperature-properties that support their excellent performance in charge-separating devices. In devices that rely on the forward injection of electrons and holes, such as light-emitting diodes (LEDs), excellent mobilities contribute to the efficient capture of non-equilibrium charge carriers by rare non-radiative centres. Moreover, the lack of bound excitons weakens the competition of desired radiative (over undesired non-radiative) recombination. Here we report a perovskite mixed material comprising a series of differently quantum-size-tuned grains that funnels photoexcitations to the lowest-bandgap light-emitter in the mixture. The materials function as charge carrier concentrators, ensuring that radiative recombination successfully outcompetes trapping and hence non-radiative recombination. We use the new material to build devices that exhibit an external quantum efficiency (EQE) of 8.8% and a radiance of 80 W sr(-1) m(-2). These represent the brightest and most efficient solution-processed near-infrared LEDs to date.
DOI
10.1038/NNANO.2016.110
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자연과학대학 > 화학·나노과학전공 > Journal papers
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