Home > News & Events : News > 2022.12 > Next-generation optoelectronic devices integrating perovskite nanocrystals and self-healing polymers –Combination of repairability and mechanical strength–

Next-generation optoelectronic devices integrating perovskite nanocrystals and self-healing polymers –Combination of repairability and mechanical strength–

December 7, 2022

Assistant Prof. Takayuki Chiba and Prof. Junji Kido of Yamagata University, and Prof. Chi-Ching Kuo of National Taipei University of Technology, have successfully developed high-efficiency light-emitting diodes (LEDs), white LED backlight with high color rendering, and low threshold perovskite lasers by combining mixed-cation perovskite Csx-1FAxPbBr3 nanocrystals and self-healing polymers.

Metal halide perovskite nanocrystals have been developed for application in photovoltaics, light emitting diodes (LEDs), and lasers because of their tunable band gap, high color purity, narrow full width at half-maximum (FWHM) emission spectrum, and high emission quantum yield. Perovskite nanocrystals with the chemical formula APbX3 (A=Cs, MA: methylammonium, FA: formamidium, X = Cl, Br, I) can be easily controlled in terms of their emission wavelength, photoluminescent quantum yield, and crystal stability by changing their chemical composition. However, perovskite nanocrystals are generally sensitive to oxygen and water, which poses a high hurdle to utilizing their excellent luminescence properties in optoelectronic devices.

Herein, mixed-cation perovskite Csx-1FAxPbBr3 nanocrystals with different ion size of cesium (Cs+) and formamidinium (FA+) cation into A-site have synthesized via two-step modified hot-injection method to enhance optical property and crystal structure. The Cs0.5FA0.5PbBr3 nanocrystal-based LED exhibited a high color purity and device efficiency. In addition, LED backlight with green and red perovskite nanocrystals dispersed in a self-healing polymer consist of triformylbenzene (TFB), diphenylmethane diisocyanate (MDI), and polydimethylsiloxane (PDMS) framework exhibited high color rendering white emission (0.33, 0.34). The self-healing polymer have strong dynamic hydrogen bonds and reversible imine bonds, which enable self-healing to reconstruct the network structure between polymers in about 4 hours. Furthermore, the Cs0.5FA0.5PbBr3 nanocrystal-based laser device with self-healing polymer-induced shattered-repaired glass substrate exhibited low lasing threshold value.

  Yamagata University and National Taipei University of Technology have an academic exchange agreement and are actively implementing a short-term study abroad exchange program (STEP-YU). Chiba and Kido groups has accepted five international students from the research group of Prof. Chi-Ching Kuo at National Taipei University of Science and Technology from 2019 to present.

Information

Journal:Advanced Materials
Title:Synergistic Effect of Cation Composition Engineering of Hybrid Cs1-xFAxPbBr3 Nanocrystals for Self-Healing Electronics Application
Authors:Fang-Cheng Liang, Fu-Cheng Jhuang, Yu-Han Fang, Jean-Sebastien Benas, Wei-Cheng Chen, Zhen-Li Yan, Wei-Chun Lin, Chun-Jen Su, Yuki Sato, Takayuki Chiba*, Junji Kido*, Chi-Ching Kuo*
DOI:doi.org/10.1002/adma.202207617

Figures


Figure 1: (a) Emission image of a sample of perovskite nanocrystals dispersed in a self-healing polymer and (b) Emission spectrum of white LED backlight with high color rendering.


Figure 2: (a) Schematic diagrams of self-healing coating perovskite nanocrystal glass substrate and (b) The integrated intensity and FWHM of perovskite nanocrystal films as a function of pump intensity.

Contacts

Takayuki Chiba
Assistant Professor, Graduate School of Organic Materials Science, Yamagata University
4-3-16 Jonan, Yonezawa, Yamagata, 992-8510 Japan
TEL:0238-26-3595
E-mail:T-chiba@yz.yamagata-u.ac.jp 

Junji Kido
Professor, Graduate School of Organic Materials Science, Yamagata University
4-3-16 Jonan, Yonezawa, Yamagata, 992-8510 Japan
TEL:0238-26-3052
E-mail:kid@yz.yamagata-u.ac.jp

Chi-Ching Kuo
Professor, Institute of Organic and Polymeric Materials, Research and Development Center of Smart Textile Technology, National Taipei University of Technology
No. 1, Sec. 3, Chung-Hsiao East Road., Taipei, 10608 Taiwan
E-mail: kuocc@mail.ntut.edu.tw

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