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Article: Mixed Spacer Cation Stabilization of Blue-Emitting n = 2 Ruddlesden–Popper Organic–Inorganic Halide Perovskite Films

TitleMixed Spacer Cation Stabilization of Blue-Emitting n = 2 Ruddlesden–Popper Organic–Inorganic Halide Perovskite Films
Authors
Keywordsblue emission
perovskite light‐emitting diodes
quasi‐2D perovskites
Ruddlesden–Popper
Issue Date2019
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, 2019, Epub, p. article no. 1901679 How to Cite?
AbstractRuddlesden–Popper halide perovskite (RPP) materials are of significant interest for light‐emitting devices since their emission wavelength can be controlled by tuning the number of layers n, resulting in improved spectral stability compared to mixed halide devices. However, RPP films typically contain phases with different n, and the low n phases tend to be unstable upon exposure to humidity, irradiation, and/or elevated temperature which hinders the achievement of pure blue emission from n = 2 films. In this work, two spacer cations are used to form an RPP film with mixed cation bilayer and high n = 2 phase purity, improved stability, and brighter light emission compared to a single spacer cation RPP. The stabilization of n = 2 phase is attributed to favorable formation energy, reduced strain, and reduced electron–phonon coupling compared to the RPP films with only one type of spacer cation. Using this approach, pure blue light‐emitting diodes (LEDs) with Commission Internationale de l'éclairage (CIE) coordinates of (0.156, 0.088) and excellent spectral stability are achieved.
DescriptionLink to Free access
Persistent Identifierhttp://hdl.handle.net/10722/280265
ISSN
2017 Impact Factor: 7.43
2015 SCImago Journal Rankings: 2.488

 

DC FieldValueLanguage
dc.contributor.authorLeung, TL-
dc.contributor.authorTAM, HW-
dc.contributor.authorLiu, F-
dc.contributor.authorLIN, J-
dc.contributor.authorNg, AMC-
dc.contributor.authorChan, WK-
dc.contributor.authorChen, W-
dc.contributor.authorHe, Z-
dc.contributor.authorLončarić, I-
dc.contributor.authorGrisanti, L-
dc.contributor.authorMa, C-
dc.contributor.authorWong, KS-
dc.contributor.authorLau, YS-
dc.contributor.authorZhu, F-
dc.contributor.authorSkoko, Ž-
dc.contributor.authorPopović, J-
dc.contributor.authorDjurisic, AB-
dc.date.accessioned2020-01-21T11:50:56Z-
dc.date.available2020-01-21T11:50:56Z-
dc.date.issued2019-
dc.identifier.citationAdvanced Optical Materials, 2019, Epub, p. article no. 1901679-
dc.identifier.issn2195-1071-
dc.identifier.urihttp://hdl.handle.net/10722/280265-
dc.descriptionLink to Free access-
dc.description.abstractRuddlesden–Popper halide perovskite (RPP) materials are of significant interest for light‐emitting devices since their emission wavelength can be controlled by tuning the number of layers n, resulting in improved spectral stability compared to mixed halide devices. However, RPP films typically contain phases with different n, and the low n phases tend to be unstable upon exposure to humidity, irradiation, and/or elevated temperature which hinders the achievement of pure blue emission from n = 2 films. In this work, two spacer cations are used to form an RPP film with mixed cation bilayer and high n = 2 phase purity, improved stability, and brighter light emission compared to a single spacer cation RPP. The stabilization of n = 2 phase is attributed to favorable formation energy, reduced strain, and reduced electron–phonon coupling compared to the RPP films with only one type of spacer cation. Using this approach, pure blue light‐emitting diodes (LEDs) with Commission Internationale de l'éclairage (CIE) coordinates of (0.156, 0.088) and excellent spectral stability are achieved.-
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.rightsThis 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.subjectblue emission-
dc.subjectperovskite light‐emitting diodes-
dc.subjectquasi‐2D perovskites-
dc.subjectRuddlesden–Popper-
dc.titleMixed Spacer Cation Stabilization of Blue-Emitting n = 2 Ruddlesden–Popper Organic–Inorganic Halide Perovskite Films-
dc.typeArticle-
dc.identifier.emailLeung, TL: peterltl@HKUCC-COM.hku.hk-
dc.identifier.emailLiu, F: liufz@hku.hk-
dc.identifier.emailChan, WK: waichan@hku.hk-
dc.identifier.emailDjurisic, AB: dalek@hku.hk-
dc.identifier.authorityChan, WK=rp00667-
dc.identifier.authorityDjurisic, AB=rp00690-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/adom.201901679-
dc.identifier.scopuseid_2-s2.0-85076740530-
dc.identifier.hkuros308920-
dc.identifier.volume2019-
dc.identifier.spagearticle no. 1901679-
dc.identifier.epagearticle no. 1901679-
dc.publisher.placeGermany-

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