Abstract
All-inorganic perovskite nanocrystals (AIPNCs) possess the advantages of narrow emission spectrum, high quantum efficiency of luminescence and tunable luminescence position, which show abroad application prospect in the fields of optoelectronic materials and devices. Ion doping can tune their pristine crystal structures and luminescent properties or endow the AIPNCs with additional functionalities. Herein, a microfluidic reactor is designed to produce the Ce3+-doped AIPNCs based on the continuous-flow reaction. The mechanism of the flow synthesis of Ce3+-doped AIPNCs is the efficient physical mixing of the precursor ions in the confined micro-channel, the reaction nucleation of crystal seeds in the poor solvent and the crystal growth of the doped AIPNCs along the flow direction. The synthesis process can be on-line monitored by an optical fiber absorption spectrometer and an optical fiber fluorescence spectrometer. The doping concentration of Ce3+ can be facilely controlled by changing the flow parameters in the microfluidic reactor, and the highest value reaches 1%. The Ce3+ doping can improve the photoluminescence efficiency and the stability of the AIPNCs. The Ce3+-doped CsPbBr3 AIPNCs can be used to manufacture green light-emitting diodes (LEDs) with a high color purity of 93.3% and white LEDs with correlated color temperature (CCT) of 10,436 K, CIE color coordinates of (0.261, 0.317) and color-rendering index (CRI) of 72.1. The continuous and controllable synthesis of AIPNCs by microfluidic reactor opens up new avenues for the application of the high-performance optoelectronic materials and devices.
摘要
全无机钙钛矿纳米晶具有发射光谱窄、发光量子效率高和 发光波长可调等优点, 在光电子材料和器件领域具有广阔的应用 前景. 离子掺杂可以调节其原始的晶体结构和发光性能, 或者赋予 其额外的功能. 本文设计了一种基于连续流动反应制备Ce3+掺杂的 全无机钙钛矿纳米晶的微流控反应器. 流动合成Ce3+掺杂全无机钙 钛矿纳米晶的机理是前驱体离子在限域微通道中的有效物理混 合、晶种在不良溶剂中的反应成核以及全无机钙钛矿纳米晶沿着 流动方向的晶体生长. 利用光纤式吸收光谱仪和光纤式荧光光谱 仪可以对合成过程进行在线监测. 通过改变微流控反应器的流动 参数, 可以便捷地控制Ce3+的掺杂浓度, 最高可达1%. Ce3+掺杂可 以提高全无机钙钛矿纳米晶的光致发光效率和稳定性. Ce3+掺杂的 CsPbBr3全无机钙钛矿纳米晶可用于制造色纯度高达93.3%的绿色 发光二极管, 以及色温为10,436 K、CIE色坐标为(0.261, 0.317)、显 色指数(CRI)为72.1的白色发光二极管. 微流控反应器连续可控合 成全无机钙钛矿纳米晶为高性能光电材料和器件的应用开辟了新 途径.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (61805047), Guangdong Special Support Program (2017TX04N371), Guangzhou Science Technology and Innovation Commission (201807010108), the Natural Science Foundation of Guangdong Province (2019A1515011379), and Foshan Municipal Science and Technology Bureau Project (2015IT100162).
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Lin P, Chen Y and Cheng Z designed the experiment. Chen H, Wei Z, Lin Y and Lin J performed the experiments. Lin P, Chen Y and Cheng Z wrote the paper. All authors contributed to the general discussion.
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Pengcheng Lin is an associate professor in Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter (Guangdong University of Technology). He received his PhD degree in polymer chemistry and physics from Northeastern University in 2016. He worked as a visiting scholar in the City University of Hong Kong from 2018 to 2019. His research interests include the manufacture of microfluidic chips, the microfluidic synthesis and application of optical materials.
Ying Chen is a professor in Guangdong University of Technology, also the dean of the School of Materials and Energy and the executive director of Guangdong Provincial Key Laboratory on Functional Soft Condensed Matter. She received her PhD degree in chemical engineering from South China University of Technology in 2003. She joined Guangdong University of Technology as a lecturer in 1994, and was promoted to professor in 2008. Her research interests focus on the energy materials and energy system.
Zhengdong Cheng received his BSc degree in modern physics from the University of Science and Technology of China in 1990. He completed his PhD in physics under the supervision of Prof. Paul M. Chaikin at Princeton University in 1998. From 2002 to 2004, he was a post-doctoral fellow in Harvard University under the supervision of Prof. David A. Weitz. He joined Texas A&M University as an assistant professor in 2004, and was promoted to professor in 2017. His current research interests focus on the design and application of microfluidic chips, optical materials and soft materials.
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Lin, P., Chen, H., Wei, Z. et al. Continuous-flow synthesis of doped all-inorganic perovskite nanocrystals enabled by a microfluidic reactor for light-emitting diode application. Sci. China Mater. 63, 1526–1536 (2020). https://doi.org/10.1007/s40843-020-1374-7
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DOI: https://doi.org/10.1007/s40843-020-1374-7