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Article: Enhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization

TitleEnhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization
Authors
Issue Date2021
PublisherWiley - VCH Verlag GmbH & Co. KGaA. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2195-1071
Citation
Advanced Optical Materials, 2021, Epub 2021-08-20, p. article no. 2100393 How to Cite?
AbstractThe performance of quasi-2D perovskite light emitting diodes (LEDs) with mixed small cations, cesium and formamidinium (FA), is significantly affected by their ratio. The best devices obtained for Cs:FA ratio of 1:1 exhibit a maximum external quantum efficiency (EQE) of 12.1%, maximum luminance of 15 070 cd m−2 and maximum current efficiency of 46.1 cd A−1, which is significantly higher (about 3 times) compared to devices with FA only (maximum EQE of 4.1%, maximum luminance of 4521 cd m−2) and Cs-only (maximum EQE of 4.0%, maximum luminance of 4886 cd m−2). The photoluminescence quantum yield of the Cs:FA 1:1 sample is similarly enhanced, 21.3% compared 5.4% and 6%, for FA-only and Cs-only samples, respectively. It can be observed that the Cs:FA ratio significantly affects the crystallization of the perovskite, with the optimal 1:1 ratio resulting in the formation of tetragonal Cs0.5FA0.5PbBr3 phase (different from cubic FAPbBr3 and orthorhombic CsPbBr3) with pronounced preferential orientation as well as a significant reduction in the trap density, which leads to a substantial improvement in the light-emitting performance.
Persistent Identifierhttp://hdl.handle.net/10722/303993
ISSN
2023 Impact Factor: 8.0
2023 SCImago Journal Rankings: 2.216
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLiu, F-
dc.contributor.authorQIN, X-
dc.contributor.authorHan, B-
dc.contributor.authorChan, CCS-
dc.contributor.authorMa, C-
dc.contributor.authorLeung, TL-
dc.contributor.authorChen, W-
dc.contributor.authorHE, Y-
dc.contributor.authorLončarić, I-
dc.contributor.authorGrisanti, L-
dc.contributor.authorOvčar, J-
dc.contributor.authorSkoko, Z-
dc.contributor.authorShi, Y-
dc.contributor.authorLing, FCC-
dc.contributor.authorHuqe, MR-
dc.contributor.authorZapien, JA-
dc.contributor.authorWang, S-
dc.contributor.authorSu, CJ-
dc.contributor.authorJeng, US-
dc.contributor.authorWong, KS-
dc.contributor.authorNg, AMC-
dc.contributor.authorGu, M-
dc.contributor.authorPopović, J-
dc.contributor.authorDjurišić, AB-
dc.date.accessioned2021-09-23T08:53:43Z-
dc.date.available2021-09-23T08:53:43Z-
dc.date.issued2021-
dc.identifier.citationAdvanced Optical Materials, 2021, Epub 2021-08-20, p. article no. 2100393-
dc.identifier.issn2195-1071-
dc.identifier.urihttp://hdl.handle.net/10722/303993-
dc.description.abstractThe performance of quasi-2D perovskite light emitting diodes (LEDs) with mixed small cations, cesium and formamidinium (FA), is significantly affected by their ratio. The best devices obtained for Cs:FA ratio of 1:1 exhibit a maximum external quantum efficiency (EQE) of 12.1%, maximum luminance of 15 070 cd m−2 and maximum current efficiency of 46.1 cd A−1, which is significantly higher (about 3 times) compared to devices with FA only (maximum EQE of 4.1%, maximum luminance of 4521 cd m−2) and Cs-only (maximum EQE of 4.0%, maximum luminance of 4886 cd m−2). The photoluminescence quantum yield of the Cs:FA 1:1 sample is similarly enhanced, 21.3% compared 5.4% and 6%, for FA-only and Cs-only samples, respectively. It can be observed that the Cs:FA ratio significantly affects the crystallization of the perovskite, with the optimal 1:1 ratio resulting in the formation of tetragonal Cs0.5FA0.5PbBr3 phase (different from cubic FAPbBr3 and orthorhombic CsPbBr3) with pronounced preferential orientation as well as a significant reduction in the trap density, which leads to a substantial improvement in the light-emitting performance.-
dc.languageeng-
dc.publisherWiley - VCH Verlag GmbH & Co. KGaA. The Journal's web site is located at http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)2195-1071-
dc.relation.ispartofAdvanced Optical Materials-
dc.rightsSubmitted (preprint) Version This is the pre-peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. Accepted (peer-reviewed) Version This is the peer reviewed version of the following article: [FULL CITE], which has been published in final form at [Link to final article using the DOI]. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.-
dc.titleEnhanced Light Emission Performance of Mixed Cation Perovskite Films—The Effect of Solution Stoichiometry on Crystallization-
dc.typeArticle-
dc.identifier.emailLiu, F: liufz@HKUCC-COM.hku.hk-
dc.identifier.emailLeung, TL: peterltl@hku.hk-
dc.identifier.emailLing, FCC: ccling@hkucc.hku.hk-
dc.identifier.authorityLing, FCC=rp00747-
dc.description.naturelink_to_subscribed_fulltext-
dc.description.naturelink_to_OA_fulltext-
dc.identifier.doi10.1002/adom.202100393-
dc.identifier.scopuseid_2-s2.0-85113168645-
dc.identifier.hkuros324906-
dc.identifier.volumeEpub 2021-08-20-
dc.identifier.spagearticle no. 2100393-
dc.identifier.epagearticle no. 2100393-
dc.identifier.isiWOS:000686517000001-
dc.publisher.placeGermany-

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