Enrichment of anchoring sites by introducing supramolecular halogen bonds for the efficient perovskite nanocrystal LEDs.

Autor: Lu P; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, China., Li T; School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China., Lu M; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, China. lumin@jlu.edu.cn., Ruan C; Changchun Cedar Electronics Technology Co., Ltd., Changchun, China., Sun S; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, China., Wu Z; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, China., Zhong Y; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, China., Zhang F; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, China., Gao Y; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, China., Huang Y; Changchun Cedar Electronics Technology Co., Ltd., Changchun, China., Wang Y; Changchun Cedar Electronics Technology Co., Ltd., Changchun, China. wangy@ccxida.com.; Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, China. wangy@ccxida.com., Hu J; Key Laboratory of Materials Physics of Ministry of Education Department of Physics and Engineering, Zhengzhou University, Zhengzhou, China., Yan F; School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing, China. fpyan@bjtu.edu.cn., Zhang Y; State Key Laboratory of Integrated Optoelectronics and College of Electronic Science and Engineering, Jilin University, Changchun, China. yuzhang@jlu.edu.cn.
Jazyk: angličtina
Zdroj: Light, science & applications [Light Sci Appl] 2023 Sep 04; Vol. 12 (1), pp. 215. Date of Electronic Publication: 2023 Sep 04.
DOI: 10.1038/s41377-023-01266-4
Abstrakt: Considering the multi-functionalization of ligands, it is crucial for ligand molecular design to reveal the landscape of anchoring sites. Here, a typical triphenylphosphine (TPP) ligand was employed to explore its effect on the surface of CsPbI 3 perovskite nanocrystals (PNCs). Except for the conventionally considered P-Pb coordination, an P-I supramolecular halogen bonding was also found on the NC surface. The coexistence of the above two types of bonding significantly increased the formation energy of iodine vacancy defects and improved the photoluminescence quantum yield of PNCs up to 93%. Meanwhile, the direct interaction of P and I enhanced the stability of the Pb-I octahedra and dramatically inhibited the migration of I ions. Furthermore, the introduction of additional benzene rings (2-(Diphenylphosphino)-biphenyl (DPB)) increased the delocalized properties of the PNC surface and significantly improved the charge transport of the PNCs. As a result, the DPB passivated CsPbI 3 NCs based top-emitting LEDs exhibite a peak external quantum efficiency (EQE) of 22.8%, a maximum luminance of 15, 204 cd m -2 , and an extremely low-efficiency roll-off of 2.6% at the current density of 500 mA cm -2 .
(© 2023. Changchun Institute of Optics, Fine Mechanics and Physics (CIOMP), CAS.)
Databáze: MEDLINE
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