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dc.contributor.authorQing, Jianen_US
dc.contributor.authorRamesh, Sankaranen_US
dc.contributor.authorXu, Qiangen_US
dc.contributor.authorLiu, Xiao-Keen_US
dc.contributor.authorWang, Heyongen_US
dc.contributor.authorYuan, Zhongchengen_US
dc.contributor.authorChen, Zhanen_US
dc.contributor.authorHou, Lintaoen_US
dc.contributor.authorSum, Tze Chienen_US
dc.contributor.authorGao, Fengen_US
dc.identifier.citationQing, J., Ramesh, S., Xu, Q., Liu, X., Wang, H., Yuan, Z., Chen, Z., Hou, L., Sum, T. C. & Gao, F. (2021). Spacer cation alloying in Ruddlesden-Popper perovskites for efficient red light-emitting diodes with precisely tunable wavelengths. Advanced Materials, 33(49), 2104381-.
dc.description.abstractPerovskite light-emitting diodes (PeLEDs) have recently shown significant progress with external quantum efficiencies (EQEs) exceeding 20%. However, PeLEDs with pure-red (620-660 nm) light emission, an essential part for full-color displays, remain a great challenge. Herein, a general approach of spacer cation alloying is employed in Ruddlesden-Popper perovskites (RPPs) for efficient red PeLEDs with precisely tunable wavelengths. By simply tuning the alloying ratio of dual spacer cations, the thickness distribution of quantum wells in the RPP films can be precisely modulated without deteriorating their charge-transport ability and energy funneling processes. Consequently, efficient PeLEDs with tunable emissions between pure red (626 nm) and deep red (671 nm) are achieved with peak EQEs up to 11.5%, representing the highest values among RPP-based pure-red PeLEDs. This work opens a new route for color tuning, which will spur future developments of pure-red or even pure-blue PeLEDs with high performance.en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofAdvanced Materialsen_US
dc.rights© 2021 The Authors. Advanced Materials published by Wiley-VCH GmbH. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and re-production in any medium, provided the original work is properly cited.en_US
dc.titleSpacer cation alloying in Ruddlesden-Popper perovskites for efficient red light-emitting diodes with precisely tunable wavelengthsen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.schoolInterdisciplinary Graduate School (IGS)en_US
dc.contributor.researchEnergy Research Institute @ NTU (ERI@N)en_US
dc.description.versionPublished versionen_US
dc.subject.keywordsLight Emitting Diodeen_US
dc.subject.keywordsTransient Absorption Spectroscopyen_US
dc.description.acknowledgementThis work was financially supported by the ERC Starting Grant (No. 717026), the Swedish Research Council VR (No. 2018–07109), the Swedish Foundation for International Cooperation in Research and Higher Education (No. CH2018-7736), and the Swedish Government Strategic Research Area in Materials Science on Functional Materials at Linköping University (Faculty Grant SFO-Mat-LiU no. 2009-00971). The computational work for this article was fully performed on resources of the National Supercomputing Centre (NSCC), Singapore ( S.R., Q.X., X.-K.L., and T.C.S. acknowledge the support from Nanyang Technological University under its start-up grant (M4080514); the Ministry of Education, Singapore, under its AcRF Tier 2 grants (MOE2019-T2-1-006 and MOE-T2EP50120-0004); and the National Research Foundation (NRF), Singapore, under its NRF Investigatorship (NRF-NRFI2018-04). L.H. thanks the NSFC Project (61774077), the Key Projects of Joint Fund of Basic and Applied Basic Research Fund of Guangdong Province (2019B1515120073, 2019B090921002, 2020A1414010036), and the Guangzhou Key laboratory of Vacuum Coating Technologies and New Energy Materials Open Projects Fund (KFVE20200006) for financial support. Z.C. thanks the project funded by China Postdoctoral Science Foundation (2020M673055). J.Q. acknowledges the support by the Science and Technology Planning Project of Guangzhou, China (Grant No. 201605030008), and the Fundamental Research Funds for the Central Universities (Grant No. 21621008)en_US
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