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High-Efficiency Formamidinium Lead Bromide Perovskite Nanocrystal-Based Light-Emitting Diodes Fabricated via a Surface Defect Self-Passivation Strategy
Huazhong Univ Sci and Technol, Peoples R China.
Huazhong Univ Sci and Technol, Peoples R China.
Huazhong Univ Sci and Technol, Peoples R China.
Linköpings universitet, Institutionen för fysik, kemi och biologi, Biomolekylär och Organisk Elektronik. Linköpings universitet, Tekniska fakulteten.
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2020 (engelsk)Inngår i: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, artikkel-id 1901390Artikkel i tidsskrift (Fagfellevurdert) Epub ahead of print
Abstract [en]

Formamidinium lead bromide (FAPbBr(3)) nanocrystals (NCs) demonstrate great potential in light-emitting diode (LED) applications due to their pure green emission and excellent stability. However, the abundant defects at the surface of the NCs act as charge trapping centers and significantly increase the trap-assisted nonradiative recombination channels, hampering the performance improvement of LEDs based on FAPbBr(3) NCs. Herein, a facile self-passivation strategy of the surface defects is developed by introducing excess formamidinium bromide (FABr) during the colloidal synthesis of NCs, leading to much improved photoluminescence quantum yield (PLQY) of the obtained NCs. In addition, enhanced charge transport property is measured in the assembled films owing to the simultaneously declined insulating ligands at the surface of NCs. The molar ratio of FABr and PbBr2 is rationally optimized during the synthesis of NCs and high-efficient green-emissive LEDs are fabricated with a champion current efficiency of 76.8 cd A(-1), corresponding to an external quantum efficiency of 17.1%, which is among the best-performing green LEDs based on perovskite NCs so far.

sted, utgiver, år, opplag, sider
WILEY-V C H VERLAG GMBH , 2020. artikkel-id 1901390
Emneord [en]
light-emitting diodes; nanocrystals; perovskites; self-passivation; surface defects
HSV kategori
Identifikatorer
URN: urn:nbn:se:liu:diva-163414DOI: 10.1002/adom.201901390ISI: 000507107300001OAI: oai:DiVA.org:liu-163414DiVA, id: diva2:1391364
Merknad

Funding Agencies|NSFC/ChinaNational Natural Science Foundation of China [51727809]; China Postdoctoral Science FoundationChina Postdoctoral Science Foundation [2017M620321]; Wuhan Science and Technology Bureau [2019010701011406]

Tilgjengelig fra: 2020-02-04 Laget: 2020-02-04 Sist oppdatert: 2020-02-04

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