Targeted elimination of tetravalent-Sn-induced defects for enhanced efficiency and stability in lead-free NIR-II perovskite LEDs
Eco-friendly Sn-based perovskites show significant potential for high-performance second near-infrared window light-emitting diodes (900 nm - 1700 nm). Nevertheless, achieving efficient and stable Sn-based perovskite second near-infrared window light-emitting diodes remains challenging due to the propensity of Sn<sup>2+</sup> to oxidize, resulting in detrimental Sn<sup>4+</sup>-induced defects and compromised device performance. Here, we present a targeted strategy to eliminate Sn<sup>4+</sup>-induced defects through moisture-triggered hydrolysis of tin tetrahalide, without degrading Sn<sup>2+</sup> in the CsSnI<sub>3</sub> film. During the moisture treatment, tin tetrahalide is selectively hydrolyzed to Sn(OH)<sub>4</sub>, which provides sustained protection. As a result, we successfully fabricate second near-infrared window light-emitting diodes emitting at 945 nm, achieving a performance breakthrough with an external quantum efficiency of 7.6% and an operational lifetime reaching 82.6 h.
Authors
- Yuqing Li (ORCID: https://orcid.org/0009-0005-1678-908X)
- Yujie Luo (ORCID: https://orcid.org/0000-0003-4070-4144)
- Jianxun Lu (ORCID: https://orcid.org/0000-0003-3163-405X)
- Fengxian Xie (ORCID: https://orcid.org/0000-0002-6274-9290)
- Kongxiang Wang (ORCID: https://orcid.org/0000-0002-2822-2786)
- Zhongtao Duan
- Yalian Weng (ORCID: https://orcid.org/0000-0001-8805-3059)
- Lingfang Zheng
- Zhanhua Wei (ORCID: https://orcid.org/0000-0003-2687-0293)
- Kebin Lin (ORCID: https://orcid.org/0009-0001-7349-6057)
- Yuanyuan Meng (ORCID: https://orcid.org/0000-0002-1338-0132)
- Junpeng Lin
- Xiang Guan
- Jing Wang (ORCID: https://orcid.org/0000-0002-3793-3264)
- Hong Liu (ORCID: https://orcid.org/0000-0002-2380-8286)
- Yang Liu (ORCID: https://orcid.org/0000-0002-7240-1546)
Institutions
- Huaqiao University (CN)
- Fudan University (CN)
- King Abdullah University of Science and Technology (SA)
Publication Details
- Journal
- Nature Communications
- Published
- 2024-11-15
- DOI
- https://doi.org/10.1038/s41467-024-54160-x
- Citations
- 36
- Primary Topic
- Perovskite Materials and Applications
- Type
- article
- Field-Weighted Citation Impact
- 7.51
Funders
- National Natural Science Foundation of China
- Huaqiao University
- National Key Research and Development Program of China