Publication: Perovskite energy funnels for efficient light-emitting diodes
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Issued Date
2016-10-01
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17483395
17483387
17483387
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2-s2.0-84976293881
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Mahidol University
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SCOPUS
Bibliographic Citation
Nature Nanotechnology. Vol.11, No.10 (2016), 872-877
Suggested Citation
Mingjian Yuan, Li Na Quan, Riccardo Comin, Grant Walters, Randy Sabatini, Oleksandr Voznyy, Sjoerd Hoogland, Yongbiao Zhao, Eric M. Beauregard, Pongsakorn Kanjanaboos, Zhenghong Lu, Dong Ha Kim, Edward H. Sargent Perovskite energy funnels for efficient light-emitting diodes. Nature Nanotechnology. Vol.11, No.10 (2016), 872-877. doi:10.1038/nnano.2016.110 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/43293
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Perovskite energy funnels for efficient light-emitting diodes
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Abstract
© 2016 Macmillan Publishers Limited, part of Springer Nature. 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 80W sr-1m-2. These represent the brightest and most efficient solution-processed near-infrared LEDs to date.