High Current Efficiency Red Perovskite Light-Emitting Diodes Meeting Rec. 2020 Standard
Cesium lead iodide light-emitting diodes (LEDs) are attractive for displays due to their Rec. 2020 red standard compliance. However, achieving high current efficiencies (CEs), which is important for displays, is challenging because their emission spectrum is near the tail of the photopic luminosity function. Substituting some iodine with bromine can improve CEs by enlarging the bandgap, but defects easily form in iodine-bromine mixed perovskites. Here, we successfully reduced defect formation by adding organic ammonium salts and zwitterions. The organic ammonium salts do not form low-dimensional perovskites under the hydrogen bonding interaction of zwitterions. Instead, they passivate the cesium vacancy by forming new hydrogen bonds after perovskite crystallization. This approach leads to a red perovskite LED with a high CE of 12.8 cd A<sup>-1</sup> and a peak external quantum efficiency of 20.3%, meeting the Rec. 2020 standard. It can be extended to large-area devices (2500 mm<sup>2</sup>) without a significant efficiency loss.
Authors
- Guanhaojie Zheng (ORCID: https://orcid.org/0000-0003-4439-2360)
- Nana Chen (ORCID: https://orcid.org/0009-0003-3105-1310)
- Jianpu Wang (ORCID: https://orcid.org/0000-0002-2158-8689)
- Xuanxuan Cao
- Guolin Zhang (ORCID: https://orcid.org/0000-0002-7603-1933)
- Wei Huang (ORCID: https://orcid.org/0000-0001-7004-6408)
- Yujing Wang (ORCID: https://orcid.org/0000-0002-4801-1281)
- Zekun Wang (ORCID: https://orcid.org/0000-0003-2528-3214)
- Runqing Lu
- Kaijie Ni (ORCID: https://orcid.org/0000-0001-8185-6780)
- Chang Yi (ORCID: https://orcid.org/0009-0003-6975-680X)
Institutions
- Nanjing Tech University (CN)
- Northwestern Polytechnical University (CN)
- Chinese Academy of Sciences (CN)
- Shanghai Advanced Research Institute (CN)
- Changzhou University (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2024-08-12
- DOI
- https://doi.org/10.1021/acs.nanolett.4c02517
- Citations
- 12
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 2.50
Funders
- National Natural Science Foundation of China
- Science and Technology Commission of Shanghai Municipality
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- Jiangsu Science and Technology Department
- National Key Research and Development Program of China