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High-Performance Perovskite Light-Emitting Diode with Enhanced Operational Stability Using Lithium Halide Passivation
Soochow Univ, Peoples R China.
Soochow Univ, Peoples R China.
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. Soochow Univ, Peoples R China.
Soochow Univ, Peoples R China.
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2020 (English)In: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773Article in journal (Refereed) Epub ahead of print
Abstract [en]

Defect passivation has been demonstrated to be effective in improving the radiative recombination of charge carriers in perovskites, and consequently, the device performance of the resultant perovskite light-emitting diodes (LEDs). State-of-the-art useful passivation agents in perovskite LEDs are mostly organic chelating molecules that, however, simultaneously sacrifice the charge-transport properties and thermal stability of the resultant perovskite emissive layers, thereby deteriorating performance, and especially the operational stability of the devices. We demonstrate that lithium halides can efficiently passivate the defects generated by halide vacancies and reduce trap state density, thereby suppressing ion migration in perovskite films. Efficient green perovskite LEDs based on all-inorganic CsPbBr3 perovskite with a peak external quantum efficiency of 16.2 %, as well as a high maximum brightness of 50 270 cd m(-2), are achieved. Moreover, the device shows decent stability even under a brightness of 10(4) cd m(-2). We highlight the universal applicability of defect passivation using lithium halides, which enabled us to improve the efficiency of blue and red perovskite LEDs.

Place, publisher, year, edition, pages
WILEY-V C H VERLAG GMBH , 2020.
Keywords [en]
lithium halides; non-radiative recombination; passivation; stability; surface defects
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Identifiers
URN: urn:nbn:se:liu:diva-163620DOI: 10.1002/anie.201914000ISI: 000509771600001PubMedID: 31872927OAI: oai:DiVA.org:liu-163620DiVA, id: diva2:1393877
Note

Funding Agencies|National Key Research and Development Program of China [2016YFA0202402]; National Natural Science Foundation of ChinaNational Natural Science Foundation of China [61974098, 61674108]; Jiangsu High Educational Natural Science Foundation [18KJA430012]; Priority Academic Program Development of Jiangsu Higher Education Institutions; 111 programMinistry of Education, China - 111 Project; Collaborative Innovation Center of Suzhou Nano Science and Technology (NANO-CIC); China Scholarship CouncilChina Scholarship Council [201806920071]; Postgraduate Research and Practice Innovation Program of Jiangsu Province [KYCX18_2504]

Available from: 2020-02-17 Created: 2020-02-17 Last updated: 2020-02-17

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