期刊
ACS NANO
卷 12, 期 2, 页码 1462-1472出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b07856
关键词
perovskite; light-emitting diodes; CsPbBr3; humidity tolerance; temperature tolerance
类别
资金
- Postdoctoral Science Foundation of China [2015M582193, 2017T100535]
- Henan Province Science and Technology Research Project [162300410229]
- National Natural Science Foundation of China [11774318, 11504331, 61176044, 11604302]
- Outstanding Young Talent Research Foundation [1521317001]
- Startup Research Foundation of Zhengzhou University [1512317003]
- Henan Province Postdoctoral Research Sponsorship [2015008]
Recently, a pressing requirement of solid-state lighting sources with high performance and low cost has motivated increasing research in metal halide perovskites. However, the relatively low emission efficiency and poor operation stability of perovskite light-emitting diodes (LEDs) are still critical drawbacks. In this study, a strategy of solution-processed all-inorganic heterostructure was proposed to overcome the emission efficiency and operation stability issues facing the challenges of perovskite LEDs. Solution-processed n-ZnO nanoparticles and p-NiO are used as the carrier injectors to fabricate all-inorganic heterostructured CsPbBr3 quantum dot LEDs, and a high efficiency green emission is achieved with maximum luminance of 6093.2 cd/m(2), external quantum efficiency of 3.79%, and current efficiency of 7.96 cd/A. More importantly, the studied perovskite LEDs possess a good operation stability after a long test time in air ambient. Typically, the devices can endure a high humidity (75%, 12 h) and a high working temperature (393 K, three heating/cooling cycles) even without encapsulation, and the operation stability is better than any previous reports. It is anticipated that this work will provide an effective strategy for the fabrication of high-performance perovskite LEDs with good stability under ambient and harsh conditions, making practical applications of such LEDs a real possibility.
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