CsPbI3 Perovskite Quantum Dots: Fine Purification and Highly Efficient Light-emitting Diodes

doi:10.6023/A20080386

Acta Chimica Sinica ›› 2021, Vol. 79 ›› Issue (1): 126-132.DOI: 10.6023/A20080386 Previous Articles

Article

CsPbI₃钙钛矿量子点的精细纯化及其高效发光二极管的研究

李严^a, 李金航^a, 许蕾梦^b, 陈嘉伟^a, 宋继中^a^,^*()

a 南京理工大学材料科学与工程学院新型显示材料与器件工信部重点实验室南京 210094
b 郑州大学物理工程学院材料物理教育部重点实验室郑州 450001

投稿日期:2020-08-21 发布日期:2020-10-17
通讯作者: 宋继中
作者简介:
* E-mail: songjizhong@njust.edu.cn
基金资助:
国家自然科学基金(51922049); 国家重大研发计划(2016YFB0401701); 江苏省科技厅(BK20180020); 中央高校基本科研基金(30920032102); 江苏高校优势学科建设工程项目

CsPbI₃ Perovskite Quantum Dots: Fine Purification and Highly Efficient Light-emitting Diodes

Yan Li^a, Jinhang Li^a, Leimeng Xu^b, Jiawei Chen^a, Jizhong Song^a^,^*()

a School of Materials Science and Engineering, MIIT Key Laboratory of Advanced Display Materials and Devices, Nanjing University of Science and Technology, Nanjing 210094, China
b School of Physics and Engineering, Ministry of Education Key Laboratory of Materials Physcis, Zhengzhou University, Zhengzhou 450001, China

Received:2020-08-21 Published:2020-10-17
Contact: Jizhong Song
Supported by:
the National Natural Science Foundation of China(51922049); the National Key Research and Development Program of China(2016YFB0401701); the Natural Science Foundation of Jiangsu Province(BK20180020); the Fundamental Research Funds for the Central Universities(30920032102); the Priority Academic Program Development of Jiangsu Higher Education Institutions

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Abstract

Perovskite quantum dot light-emitting diodes (QLEDs) possess the characteristics of high color purity, precise color control, wide gamut, and solution processibility, which shows great prospects in displays and lightings. However, red CsPbI₃ quantum dots (QDs) are prone to luminescence degradation due to the thermal non-equilibrium-induced phase transition and ligand loss during the purification process. The purification of CsPbI₃ QDs is more difficult than that of CsPbBr₃ QDs. Because the ligands on the surface of the quantum dots will be lost continuously during the purification process, resulting in aggregation and transformation toδ-CsPbI₃ phase. Aiming at this problem, We prepared the CsPbI₃ QDs through a hot-injection method at 180 ℃. The original solution of the perovskite QD also contains impurities such as octadecene solvent, oleic amine, and oleic acid ligand, which will seriously affect the photoelectric properties and destroy the film. So we used different flocculation solvents and dispersion solvents to collaboratively purify the QDs. At last, our work developed a mixed-solvent purification strategy with toluene and ethyl acetate, which can avoid the phase transition during the purification process and lead to pure cubic CsPbI₃ QDs. But when we do not add the additional ligands in purification process, the photoluminescence quantum yield (PLQY) of QDs will be far less than 100%. In order to enhance the PLQY, a ligand compensation strategy of using oleylammonium iodide (OAmI) to control the surface state of QDs was proposed, which reduced the surface defects and solved the problem of luminescence quenching caused by ligand loss. We found that 400 μL OAmI enabled quantum dots to have both high PLQY of 70% and excellent electrical properties. Under electrically driven, the exciton recombination probability was significantly increased, and the CsPbI₃- based QLED achieved a maximum luminance of 3090 cd/m² and a maximum external quantum efficiency (EQE) of 15.67%. The proposed fine purification strategy of CsPbI₃ QDs has an important guiding significance for the development of high-efficiency QD materials and high-performance optoelectronic devices.

Key words: inorganic perovskite quantum dot, purification, ligand compensation, quantum dot light-emitting diodes (QLEDs), CsPbI3

Cite this article

Yan Li, Jinhang Li, Leimeng Xu, Jiawei Chen, Jizhong Song. CsPbI₃ Perovskite Quantum Dots: Fine Purification and Highly Efficient Light-emitting Diodes[J]. Acta Chimica Sinica, 2021, 79(1): 126-132.

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Fig. & Tab. 5

Figure 1. (a) Schematic illustration of the effect of solvent on CsPbI3 QDs and the surface ligand loss during the purification process, and (b) schematic diagram of CsPbI3 quantum dot purification process

Figure 2. Optical properties of CsPbI3 quantum dots after purifying with different flocculating solvents: (a) XRD patterns, (b) photographs of CsPbI3 QD inks without (upper) and with (below) UV light excitation, (c) photoluminescence spectra, and (d) photoluminescence lifetime curves

Figure 3. Performance of CsPbI3 quantum dots using different dispersible solvents: (a) photographs of CsPbI3 QD inks without (upper) and with (below) UV light excitation, (b) photoluminescence spectra, (c) current density curve, and (d) AFM image

Figure 4. (a) Energy level diagram of the QLED, (b) the relationship between EQE and brightness of the device with different dispersible solvents, and (c) summarization of the device performance with different purification methods T—Toluene, I—Isopropanol, E—Ethyl acetate, B—Butyl acetate, H—Hexane, O—Octane

Figure 5. The effects of compensation ligands on QD and QLED performances: (a) the photoluminescence spectra of QDs with different types of ligands, (b) the photoluminescence spectra of QDs with different concentrations of OAmI, (c) ln(α) as a function of hν, (d) current density as a function of votalge, (e) brightness as a function of voltage, and (f) EQE as a function of current density

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CsPbI₃钙钛矿量子点的精细纯化及其高效发光二极管的研究

CsPbI₃ Perovskite Quantum Dots: Fine Purification and Highly Efficient Light-emitting Diodes

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CsPbI3钙钛矿量子点的精细纯化及其高效发光二极管的研究