High color purity lead-free perovskite light-emitting diodes via SN stabilization

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dc.contributor.authorLiang, Hongyan
dc.contributor.authorYuan, Fanglong
dc.contributor.authorJohnston, Andrew
dc.contributor.authorGao, Congcong
dc.contributor.authorChoubisa, Hitarth
dc.contributor.authorGao, Yuan
dc.contributor.authorWang, Ya-Kun
dc.contributor.authorSagar, Laxmi Kishore
dc.contributor.authorSun, Bin
dc.contributor.authorLi, Peicheng
dc.contributor.authorBappi, Golam
dc.contributor.authorChen, Bin
dc.contributor.authorLi, Jun
dc.contributor.authorWang, Yunkun
dc.contributor.authorDong, Yitong
dc.contributor.authorMa, Dongxin
dc.contributor.authorGao, Yunan
dc.contributor.authorLiu, Yongchang
dc.contributor.authorYuan, Mingjian
dc.contributor.authorSaidaminov, Makhsud I.
dc.contributor.authorHoogland, Sjoerd
dc.contributor.authorLu, Zheng-Hong
dc.contributor.authorSargent, Edward H.
dc.date.accessioned2025-01-23T18:38:36Z
dc.date.available2025-01-23T18:38:36Z
dc.date.issued2020
dc.description.abstractPerovskite-based light-emitting diodes (PeLEDs) are now approaching the upper limits of external quantum efficiency (EQE); however, their application is currently limited by reliance on lead and by inadequate color purity. The Rec. 2020 requires Commission Internationale de l'Eclairage coordinates of (0.708, 0.292) for red emitters, but present-day perovskite devices only achieve (0.71, 0.28). Here, lead-free PeLEDs are reported with color coordinates of (0.706, 0.294)—the highest purity reported among red PeLEDs. The variation of the emission spectrum is also evaluated as a function of temperature and applied potential, finding that emission redshifts by <3 nm under low temperature and by <0.3 nm V-¹ with operating voltage. The prominent oxidation pathway of Sn is identified and this is suppressed with the aid of H3PO2. This strategy prevents the oxidation of the constituent precursors, through both its moderate reducing properties and through its forming complexes with the perovskite that increase the energetic barrier toward Sn oxidation. The H3PO2 additionally seeds crystal growth during film formation, improving film quality. PeLEDs are reported with an EQE of 0.3% and a brightness of 70 cd m-²; this is the record among reported red-emitting, lead-free PeLEDs.
dc.description.reviewstatusReviewed
dc.description.scholarlevelFaculty
dc.description.sponsorshipH.Y.L., F.L.Y., A.J., and C.C.G. contributed equally to this work. H.Y.L. acknowledges financial support from the National Natural Science Foundation of China (NSFC) (No. 51771132), Recruitment Program of Global Youth Experts of China Talents Plan of China, the Natural Sciences and Engineering Research Council of Canada (NSERC) Postdoctoral Fellowship (PDF). E.H.S. and all co-authors from the Department of Electrical and Computer Engineering at the University of Toronto acknowledge the financial support by the Global Research Outreach program of Samsung Advanced Institute of Technology and the Ontario Research Fund Research Excellence Program and the Natural Sciences and Engineering Research Council of Canada (NSERC).
dc.identifier.citationLiang, H., Yuan, F., Johnston, A., Gao, C., Choubisa, H., Gao, Y., Wang, Y., Sagar, L. K., Sun, B., Li, P., Bappi, G., Chen, B., Li, J., Wang, Y., Dong, Y., Ma, D., Gao, Y., Liu, Y., Yuan, M., . . . Sargent, E. H. (2020b). High color purity lead-free perovskite light-emitting diodes via SN stabilization. Advanced Science, 7(8). https://doi.org/10.1002/advs.201903213
dc.identifier.urihttp://dx.doi.org/10.1002/advs.201903213
dc.identifier.urihttps://hdl.handle.net/1828/20990
dc.language.isoen
dc.publisherAdvanced Science
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subject.departmentDepartment of Chemistry
dc.subject.departmentDepartment of Electrical and Computer Engineering
dc.titleHigh color purity lead-free perovskite light-emitting diodes via SN stabilization
dc.typeArticle

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