Abstract
Cesium lead halide perovskite nanocrystals (NCs) have attracted unprecedented attention owing to their compelling properties for optoelectronic applications. Compared with the classical hot-injection method, the room-temperature (RT) synthetic strategy is more facile and tender, but it is hard to obtain stable CsPbI3 NCs and it usually uses polar solvents that sometimes reduce the stability and properties of NCs. Here, we reported a simple approach to synthesize highly efficient and stable CsPbI3 as well as other color-tunable CsPbX3 NCs with high quantum efficiency at room temperature via an anion exchange at the water-oil interface, in which the as-synthesized pristine CsPbBr3 NCs in toluene were treated in aqueous solutions of HX (X=Cl, Br, and I) and protonated oleylamine (OAm) acted as a carrier. The synthesized CsPbI3 NCs had an emission at 680 nm and even showed excellent colloidal stability after being stored for 32 d. The high efficiency and stability of the obtained CsPbX3 NCs were ascribed to the facts that: (i) the polar reagents were almost removed from the surface of NCs; (ii) the defect-related nonradiative recombination was suppressed efficiently by surface passivation.
摘要
全无机CsPbX3钙钛矿纳米晶因其卓越的发光性能而在光电领域引起了前所未有的关注. 相对于传统的热注射法, 室温法是一 种更简单、 温和的合成钙钛矿纳米晶的方法. 然而, 在室温下很难 获得稳定的CsPbI3纳米晶, 并且室温法通常会使用极性溶剂, 这些溶剂有时会降低钙钛矿纳米晶的稳定性和性能. 本文提出了一种 简单的合成方法, 通过在水-油界面处的阴离子交换, 在室温下合成了高效稳定的CsPbI3纳米晶以及其他CsPbX3纳米晶. 在合成过程中, 质子化的油胺充当载体. 测试分析结果表明: 所合成的CsPbI3 纳米晶的发射峰位于680 nm, 且在保存32天后仍然具有极好的发光稳定性. 所合成的CsPbX3纳米晶的高量子效率和稳定性可归因于: (i) 极性试剂几乎从纳米晶溶液中去除; (ii) 通过表面钝化有效地抑制了与缺陷有关的非辐射复合.
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Acknowledgements
This work was supported by the Natural Science Foundation of Fujian Province (2019J05041), the Education Foundation of Fujian Province (JAT170021), and the “Double-First Class” Foundation of Materials and Intelligent Manufacturing Discipline of Xiamen University.
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Author contributions Tang X and Xie RJ conceived and designed the experiments; Fang C and Cai Y performed the experiments; Fang C and Li Y analyzed the data; Zhou TL contributed the materials tools; Fang C and Xie RJ wrote the paper.
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Cong Fang is currently a graduate student at the College of Materials, Xiamen University. He obtained his bachelor degree from Fujian University of Technology in 2017. His current research focuses on the synthesis of perovskite nanocrystals.
Rong-Jun Xie received his PhD degree from Shanghai Institute of Ceramics, Chinese Academy of Sciences in 1998. He was Science and Technology Agency (STA) research fellow at the National Institute for Research in Inorganic Materials (Japan, 1998–2000), and Japan Science and Technology Agency (JST) research fellow at the National Institute of Advanced Industrial Science and Technology (Japan, 2001–2002) and Alexander von Humboldt research fellow at Darmstadt University of Technology (Germany, 2002–2003). He joined the National Institute for Materials Science (Japan) as Senior Researcher (2003–2007), Principal Researcher (2007–2014) and Chief Researcher (2014–2017). Since 2018, he has been a full professor in the College of Materials, Xiamen University (China). His research interests include the syntheses and applications of luminescent materials (phosphors, quantum dots (QDs), metal-organic frameworks (MOFs)), solid state lighting and other optoelectronic devices
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Facial synthesis of highly stable and bright CsPbX3 (X = Cl, Br, I) perovskite nanocrystals via an anion exchange at the water-oil interface
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Fang, C., Li, Y., Cai, Y. et al. Facial synthesis of highly stable and bright CsPbX3 (X=Cl, Br, I) perovskite nanocrystals via an anion exchange at the water-oil interface. Sci. China Mater. 64, 158–168 (2021). https://doi.org/10.1007/s40843-020-1379-4
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DOI: https://doi.org/10.1007/s40843-020-1379-4