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dc.contributor.authorWang, Ya-Kun
dc.contributor.authorYuan, Fanglong
dc.contributor.authorDong, Yitong
dc.contributor.authorLi, Jiao-Yang
dc.contributor.authorJohnston, Andrew
dc.contributor.authorChen, Bin
dc.contributor.authorSaidaminov, Makhsud I.
dc.contributor.authorZhou, Chun
dc.contributor.authorZheng, Xiaopeng
dc.contributor.authorHou, Yi
dc.contributor.authorBertens, Koen
dc.contributor.authorEbe, Hinako
dc.contributor.authorMa, Dongxin
dc.contributor.authorDeng, Zhengtao
dc.contributor.authorYuan, Shuai
dc.contributor.authorChen, Rui
dc.contributor.authorSagar, Laxmi Kishore
dc.contributor.authorLiu, Jiakai
dc.contributor.authorFan, James
dc.contributor.authorLi, Peicheng
dc.contributor.authorLi, Xiyan
dc.contributor.authorGao, Yuan
dc.contributor.authorFung, Man-Keung
dc.contributor.authorLu, Zheng-Hong
dc.contributor.authorBakr, Osman
dc.contributor.authorLiao, Liang-Sheng
dc.contributor.authorSargent, Edward Hartley
dc.date.accessioned2021-06-10T08:36:04Z
dc.date.available2021-06-10T08:36:04Z
dc.date.issued2021-06-14
dc.date.submitted2021-04-08
dc.identifier.citationWang, Y.-K., Yuan, F., Dong, Y., Li, J.-Y., Johnston, A., Chen, B., … Sargent, E. H. (2021). All-inorganic quantum dot LEDs based on phase-stabilized α-CsPbI3 perovskite. Angewandte Chemie. doi:10.1002/ange.202104812
dc.identifier.issn0044-8249
dc.identifier.issn1521-3757
dc.identifier.doi10.1002/ange.202104812
dc.identifier.doi10.1002/anie.202104812
dc.identifier.urihttp://hdl.handle.net/10754/669504
dc.description.abstractThe all-inorganic nature of CsPbI 3 perovskites offers an avenue to enhance stability in perovskite devices. Concerted research efforts have led to improved stability of the black phase in CsPbI 3 films; however, these strategies – including strain and doping – are based on organic-ligand-capped perovskites, which prevent perovskites from forming the close-packed QD solids necessary to achieve high charge transport and thermal transport. Here we develop an inorganic ligand exchange that leads to CsPbI 3 QD films that unite superior phase stability with increased thermal transport. We demonstrate that the atomic ligand exchanged QD films, once mechanically coupled, exhibit improved phase stability, and we link this to distributing strain across the film. Further, operando measurements of the temperature of LEDs indicate that KI-exchanged QD films exhibit increased thermal transport compared to controls that rely on organic ligands. The LEDs exhibit a maximum EQE of 23% with EL emission centered at 640 nm (FWHM of ~31 nm). These red LEDs provide an operating half lifetime of 10 hours (luminance of 200 cd/m 2 ), an operating stability that is 6x higher than that of control devices.
dc.description.sponsorshipThis work was supported by the Ontario Research Fund Research-Excellence Program and the Natural Sciences and Engineering Research Council of Canada (NSERC grant number 216956-12). M.I.S. acknowledges the support of Banting Postdoctoral Fellowship Program administered by the Government of Canada. We acknowledge financial support from Natural Science Foundation of China (Nos. 51821002, 91733301) and the Collaborative Innovation Center of Suzhou Nano Science and Technology. Y.K. Wang acknowledges the financial support of the China Scholarship Council (No. 201806920067). Z.H.L acknowledges the financial support of the National Natural Science Foundation of China (grant number 11774304)
dc.publisherWiley
dc.relation.urlhttps://onlinelibrary.wiley.com/doi/10.1002/ange.202104812
dc.rightsArchived with thanks to Angewandte Chemie
dc.titleAll-inorganic quantum dot LEDs based on phase-stabilized α-CsPbI3 perovskite
dc.typeArticle
dc.contributor.departmentFunctional Nanomaterials Lab (FuNL)
dc.contributor.departmentKAUST Catalysis Center (KCC)
dc.contributor.departmentMaterial Science and Engineering
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalAngewandte Chemie
dc.rights.embargodate2022-05-12
dc.eprint.versionPost-print
dc.contributor.institutionUniversity of Toronto Electrical and Computer Engineering CANADA
dc.contributor.institutionSoochow University Institute of Functional Nano & Soft Materials (FUNSOM) CHINA
dc.contributor.institutionNanjing University College of Engineering and Applied Sciences CHINA
dc.contributor.institutionSouthern University of Science and Technology Department of Electrical and Electronic Engineering CHINA
dc.contributor.institutionUniversity of Toronto Department of Materials Science and Engineering CANADA
dc.contributor.institutionUniversity of Toronto ECE 10 King's College RoadECE, Galbraith Building, Room GB447 M5S 3G4 Toronto CANADA
kaust.personZheng, Xiaopeng
kaust.personLiu, Jiakai
kaust.personBakr, Osman M.
dc.date.accepted2021-05-10
refterms.dateFOA2021-06-10T08:37:27Z
dc.date.published-online2021-06-14
dc.date.published-print2021-07-12


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