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Article: Phase control for quasi-2D blue emitters by spacer cation engineering

TitlePhase control for quasi-2D blue emitters by spacer cation engineering
Authors
KeywordsHALIDE PEROVSKITES
PSEUDOPOTENTIALS
Issue Date2020
PublisherRSC Publications. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/tc#!recentarticles&all
Citation
Journal of Materials Chemistry C, 2020, v. 8 n. 32, p. 11052-11060 How to Cite?
AbstractThe effect of alkylammonium tail length in phenyl-alkyl spacer cations in quasi-2D Ruddlesden–Popper perovskites on the phase distribution in low n films (n = 2 stoichiometry) is investigated. An increase in alkyl chain length suppresses the formation of the n = 1 phase (and consequently higher n phases), which is attributed to the change in the packing arrangement of spacer cations from parallel (one and two carbon atom alkyl chains) to non-parallel (3 carbon atom alkyl chains). A single blue emission peak corresponding to the n = 3 phase (466 nm) and n = 2 phase (436 nm) is obtained in the PL spectra of phenylpropylammonium quasi-2D perovskites with methylammonium (MA) and formamidinium (FA) cations, respectively. The same trends in phase distribution, namely a reduction in the proportion of the n = 1 phase with increasing alkyl chain length, are observed for both MA- and FA-based perovskites. However, FA-based samples exhibited higher crystallinity but worsened morphology (more pinholes) and less efficient funneling compared to MA-based samples. Consequently, efficient sky-blue LEDs with the highest EQE of 3.35% are obtained for PPA2MAPb2Br7 perovskite.
Persistent Identifierhttp://hdl.handle.net/10722/286636
ISSN
2019 Impact Factor: 7.059
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTam, HW-
dc.contributor.authorLeung, TL-
dc.contributor.authorSUN, W-
dc.contributor.authorLiu, F-
dc.contributor.authorMa, C-
dc.contributor.authorWong, KS-
dc.contributor.authorLončarić, I-
dc.contributor.authorGrisanti, L-
dc.contributor.authorOvčar, J-
dc.contributor.authorSkoko, Z-
dc.contributor.authorPopović, J-
dc.contributor.authorDjurisic, AB-
dc.date.accessioned2020-09-04T13:28:22Z-
dc.date.available2020-09-04T13:28:22Z-
dc.date.issued2020-
dc.identifier.citationJournal of Materials Chemistry C, 2020, v. 8 n. 32, p. 11052-11060-
dc.identifier.issn2050-7526-
dc.identifier.urihttp://hdl.handle.net/10722/286636-
dc.description.abstractThe effect of alkylammonium tail length in phenyl-alkyl spacer cations in quasi-2D Ruddlesden–Popper perovskites on the phase distribution in low n films (n = 2 stoichiometry) is investigated. An increase in alkyl chain length suppresses the formation of the n = 1 phase (and consequently higher n phases), which is attributed to the change in the packing arrangement of spacer cations from parallel (one and two carbon atom alkyl chains) to non-parallel (3 carbon atom alkyl chains). A single blue emission peak corresponding to the n = 3 phase (466 nm) and n = 2 phase (436 nm) is obtained in the PL spectra of phenylpropylammonium quasi-2D perovskites with methylammonium (MA) and formamidinium (FA) cations, respectively. The same trends in phase distribution, namely a reduction in the proportion of the n = 1 phase with increasing alkyl chain length, are observed for both MA- and FA-based perovskites. However, FA-based samples exhibited higher crystallinity but worsened morphology (more pinholes) and less efficient funneling compared to MA-based samples. Consequently, efficient sky-blue LEDs with the highest EQE of 3.35% are obtained for PPA2MAPb2Br7 perovskite.-
dc.languageeng-
dc.publisherRSC Publications. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/tc#!recentarticles&all-
dc.relation.ispartofJournal of Materials Chemistry C-
dc.subjectHALIDE PEROVSKITES-
dc.subjectPSEUDOPOTENTIALS-
dc.titlePhase control for quasi-2D blue emitters by spacer cation engineering-
dc.typeArticle-
dc.identifier.emailLeung, TL: peterltl@hku.hk-
dc.identifier.emailLiu, F: liufz@hku.hk-
dc.identifier.emailDjurisic, AB: dalek@hku.hk-
dc.identifier.authorityDjurisic, AB=rp00690-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1039/D0TC01631D-
dc.identifier.scopuseid_2-s2.0-85092293292-
dc.identifier.hkuros314140-
dc.identifier.volume8-
dc.identifier.issue32-
dc.identifier.spage11052-
dc.identifier.epage11060-
dc.identifier.isiWOS:000561265700037-
dc.publisher.placeUnited Kingdom-

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