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Ligand-Induced Cation-p Interactions Enable High-Efficiency, Bright, and Spectrally Stable Rec. 2020 Pure-Red Perovskite Light-Emitting Diodes
Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering. Zhengzhou Univ, Peoples R China.
Nanjing Univ Sci & Technol, Peoples R China; Nanjing Univ Posts & Telecommun NUPT, Peoples R China.
Jinan Univ, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Electronic and photonic materials. Linköping University, Faculty of Science & Engineering.
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2023 (English)In: Advanced Materials, ISSN 0935-9648, E-ISSN 1521-4095, article id 2303938Article in journal (Refereed) Epub ahead of print
Abstract [en]

Achieving high-performance perovskite light-emitting diodes (PeLEDs) with pure-red electroluminescence for practical applications remains a critical challenge because of the problematic luminescence property and spectral instability of existing emitters. Herein, high-efficiency Rec. 2020 pure-red PeLEDs, simultaneously exhibiting exceptional brightness and spectral stability, based on CsPb(Br/I)(3) perovskite nanocrystals (NCs) capping with aromatic amino acid ligands featuring cation-pi interactions, are reported. It is proven that strong cation-pi interactions between the PbI6-octahedra of perovskite units and the electron-rich indole ring of tryptophan (TRP) molecules not only chemically polish the imperfect surface sites, but also markedly increase the binding affinity of the ligand molecules, leading to high photoluminescence quantum yields and greatly enhanced spectral stability of the CsPb(Br/I)(3) NCs. Moreover, the incorporation of small-size aromatic TRP ligands ensures superior charge-transport properties of the assembled emissive layers. The resultant devices emitting at around 635 nm demonstrate a champion external quantum efficiency of 22.8%, a max luminance of 12 910 cd m(-2), and outstanding spectral stability, representing one of the best-performing Rec. 2020 pure-red PeLEDs achieved so far.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2023. article id 2303938
Keywords [en]
cation-pi interactions; perovskite nanocrystals; pure-red light-emitting diodes; spectral stability; surface ligands
National Category
Theoretical Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-198820DOI: 10.1002/adma.202303938ISI: 001081292400001PubMedID: 37464982OAI: oai:DiVA.org:liu-198820DiVA, id: diva2:1808224
Note

Funding Agencies|This work was supported by the National Key Ramp;D Program of China (2022YFB3603003), the Swedish Research Council Vetenskapsrdet (grant 2020-03564), and the Swedish Government Strategic Research Area in Materials Science on Functional Materials at [2022YFB3603003]; National Key Ramp;D Program of China [2020-03564]; Swedish Research Council Vetenskapsrdet [2009-00971]; Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linkping University [214-0364]; Olle Engkvists Byggmstare Stiftelse [61774077]; National Natural Science Foundation of China Project [2019B1515120073, 2019B090921002, G20200019046]; Key Projects of Joint Fund of Basic and Applied Basic Research Fund of Guangdong Province [KFVE20200006]; Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials Open Projects Fund [12074347, 61935009]; National Natural Science Foundation of China [212300410019]; Science Foundation for Distinguished Young Scholars of Henan Province [2020A1515110527, 2020A1515110384]; Guangdong Basic and Applied Basic Research Foundation

Available from: 2023-10-30 Created: 2023-10-30 Last updated: 2023-10-30

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