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Boosting Perovskite Light-Emitting Diode Performance via Tailoring Interfacial Contact
Soochow Univ, Peoples R China; Soochow Univ, Peoples R China.
Soochow Univ, Peoples R China; Soochow Univ, Peoples R China.
Chinese Acad Sci, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering.
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2018 (English)In: ACS Applied Materials and Interfaces, ISSN 1944-8244, E-ISSN 1944-8252, Vol. 10, no 28, p. 24320-24326Article in journal (Refereed) Published
Abstract [en]

Solution-processed perovskite light-emitting diodes (LEDs) have attracted wide attention in the past several years. However, the overall efficiency and stability of perovskite-based LEDs remain inferior to those of organic or quantum dot LEDs. Nonradiative charge recombination and the unbalanced charge injection are two critical factors that limit the device efficiency and operational stability of perovskite LEDs. Here, we develop a strategy to modify the interface between the hole transport layer and the perovskite emissive layer with an amphiphilic conjugated polymer of poly[(9,9-bis(3-(N,N-dimethylamino)propy1)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)] (PFN). We show evidences that PFN improves the quality of the perovskite film, which effectively suppresses nonradiative recombination. By further improving the charge injection balance rate, a green perovskite LED with a champion current efficiency of 45.2 cd/A, corresponding to an external quantum efficiency of 14.4%, is achieved. In addition, the device based on the PFN layer exhibits improved operational lifetime. Our work paves a facile way for the development of efficient and stable perovskite LEDs.

Place, publisher, year, edition, pages
AMER CHEMICAL SOC , 2018. Vol. 10, no 28, p. 24320-24326
Keywords [en]
perovskite; light-emitting diodes; charge carrier injection; high efficiency; stability
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:liu:diva-150261DOI: 10.1021/acsami.8b07438ISI: 000439528400099PubMedID: 29926721OAI: oai:DiVA.org:liu-150261DiVA, id: diva2:1239764
Note

Funding Agencies|National Key Research and Development Program of China [2016YFA0202402]; National Natural Science Foundation of China [91123005, 61674108, 11550110176, 11605278, 11675252]; Priority Academic Program Development of Jiangsu Higher Education Institutions; 111 program; Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC); VINNMER

Available from: 2018-08-17 Created: 2018-08-17 Last updated: 2018-08-17

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