Journal
CHEMICAL ENGINEERING JOURNAL
Volume 433, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.133556
Keywords
Zero-dimensional perovskite; Cs4PbBr6 nanocrystals; Phase transformation; Electroluminescent light-emitting diodes
Categories
Funding
- National Natural Science Foundation of China [61935009, 51772123, 61822506, 11974142, 12104178, 12174151]
- Science and Technology Development Program of Jilin Province [20200401059GX]
- Open Project Program of Key Laboratory of New Energy and Rare Earth Resource Utilization of State Ethnic Affairs Commission, Dalian Minzu University [NERE201902]
- Open Project Program of State Key Laboratory of Applied Optics [SKLAO-201908]
- Fundamental Research Funds for the Central Universities
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This study successfully transformed nonluminescent Cs4PbBr6 nanocrystals into highly luminescent Zn-doped CsPbBr3/Cs4PbBr6 nanocrystals through an insertion reaction, resulting in improved photoluminescence quantum yield. These nanocrystals were used as emitters in LED devices, achieving high performance.
Zero-dimensional (0D) perovskites have attracted a great deal of attention over the last few years due to their fascinating properties. However, their application in electroluminescent (EL) Light-emitting diodes (LEDs) is limited and suffering from extremely low device performance. Herein, the nonluminescent Cs4PbBr6 nanocrystals (NCs) were successfully transformed to highly luminescent Zn-doped CsPbBr3/Cs4PbBr6 NCs via an insertion reaction with ZnBr2, which changed the atomic molar ratios of NCs and promoted the formation of CsPbBr3. In this reaction, the Zn2+ ions provided by ZnBr2 together with the Pb2+ ions can occupy the B-site due to the similar ion radius. The extra Br- ions not only can facilitate the transformation process, but also can passivate the surface defects of the NCs, resulting in high photoluminescence quantum yield (PL QY) of 77.5%. Furthermore, as-synthesized Zn-doped CsPbBr3/Cs4PbBr6 NCs were used as emitters to fabricate EL LEDs. The device achieved the maximum current efficiency of 9.8 cd/A and a peak external quantum efficiency of 3.2%, which is the best performance of the CsPbBr3/Cs4PbBr6 based LEDs. This reveals the great application potential of CsPbBr3/Cs4PbBr6 NCs as EL emitters in LEDs.
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