Journal
NATURE PHOTONICS
Volume 15, Issue 11, Pages 843-849Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41566-021-00857-0
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Funding
- Laboratory Directed Research and Development programme at Los Alamos National Laboratory (LANL)
- J. Robert Oppenheimer Distinguished Postdoc Fellowship at LANL
- National Academy of Sciences Ford Foundation Fellowship
- National Science Foundation Graduate Research Fellowship Program (NSFGRFP) [DGE-1656518]
- Ministry of Science and Technology [MOST 108-2113-M-002-015-MY3, 108-2911-I-002-561]
- Academia Sinica [AS-iMATE-109-31]
- Center of Atomic Initiative for New Materials, National Taiwan University from the Featured Areas Research Center Program
- US Department of Energy (DOE) Office of Science [89233218CNA000001]
- US DOE, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
- Laboratory Directed Research and Development from Argonne National Laboratory by the Office of Science, of the US DOE [DE-AC02-06CH11357]
- US DOE Office of Science Facility, at Brookhaven National Laboratory [DE-SC0012704]
- National Science Foundation [ECCS-1542152]
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The use of metal-organic frameworks to stabilize perovskite nanocrystals for LED production results in bright and stable light emission, overcoming the instability issues associated with solid films.
Perovskite nanocrystals are exceptional candidates for light-emitting diodes (LEDs). However, they are unstable in the solid film and tend to degrade back to the bulk phase, which undermines their potential for LEDs. Here we demonstrate that perovskite nanocrystals stabilized in metal-organic framework (MOF) thin films make bright and stable LEDs. The perovskite nanocrystals in MOF thin films can maintain the photoluminescence and electroluminescence against continuous ultraviolet irradiation, heat and electrical stress. As revealed by optical and X-ray spectroscopy, the strong emission originates from localized carrier recombination. Bright LEDs made from perovskite-MOF nanocrystals are demonstrated with a maximum external quantum efficiency of over 15% and a high brightness of over 10(5) cd m(-2) after the device reaches stabilization. During LED operation, the nanocrystals can be well preserved, free of ion migration or crystal merging through protection by the MOF matrix, leading to a stable performance over 50 hours. The use of metal-organic frameworks helps protect perovskite nanocrystals, resulting in bright, stable light-emitting diodes.
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