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Article: Single-phase alkylammonium cesium lead iodide quasi-2D perovskites for color-tunable and spectrum-stable red LEDs

TitleSingle-phase alkylammonium cesium lead iodide quasi-2D perovskites for color-tunable and spectrum-stable red LEDs
Authors
KeywordsAlkylammonium cations
Annealing temperatures
Display application
Emission spectrums
Emission wavelength
Issue Date2019
PublisherRSC Publications. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/nr#!recentarticles&all
Citation
Nanoscale, 2019, v. 11 n. 36, p. 16907-16918 How to Cite?
AbstractWhile red is one of the primary colors for display applications, the investigation of visible red emitting perovskites, particularly 2D perovskites, is relatively limited. In this work, we demonstrate a single-phase Ruddlesden–Popper quasi-2D (C3H7NH3)2CsPb2I7 perovskite for red color LEDs. Through increasing the annealing temperature of (C3H7NH3)2CsPb2I7 perovskite thin films, we have successfully achieved tunable emission wavelengths from 654 to 691 nm. Equally important, for all the quasi-2D perovskite LEDs, once the annealing temperature is fixed, the emission spectrum is independent of bias voltages, which is very important for their use in lighting and displays. With the analysis of the crystallinity, morphology, and thermodynamic stability of the quasi-2D perovskite, we find that the obtained (C3H7NH3)2CsPb2I7 perovskite is a single-phase quasi-2D perovskite with only n = 2 phase. Besides, we found that the red shifting of emission wavelength is caused by the increase of perovskite crystal size while increasing the annealing temperature. Our results also show that the temperature-induced color tunability can be applied to a series of quasi-2D perovskites with different alkylammonium cations. Importantly, we find that short alkylammonium spacers offer better electrical properties for efficient current transport and high performance in LED applications. This work contributes to controlling the optoelectronic properties of quasi-2D perovskites via controlling their crystal growth as well as paves the way to realize practical lighting and display applications of perovskite LEDs.
Persistent Identifierhttp://hdl.handle.net/10722/288087
ISSN
2019 Impact Factor: 6.895
2015 SCImago Journal Rankings: 2.969

 

DC FieldValueLanguage
dc.contributor.authorLin, H-
dc.contributor.authorMao, J-
dc.contributor.authorQin, M-
dc.contributor.authorSong, Z-
dc.contributor.authorYin, W-
dc.contributor.authorLu, X-
dc.contributor.authorChoy, WCH-
dc.date.accessioned2020-10-05T12:07:41Z-
dc.date.available2020-10-05T12:07:41Z-
dc.date.issued2019-
dc.identifier.citationNanoscale, 2019, v. 11 n. 36, p. 16907-16918-
dc.identifier.issn2040-3364-
dc.identifier.urihttp://hdl.handle.net/10722/288087-
dc.description.abstractWhile red is one of the primary colors for display applications, the investigation of visible red emitting perovskites, particularly 2D perovskites, is relatively limited. In this work, we demonstrate a single-phase Ruddlesden–Popper quasi-2D (C3H7NH3)2CsPb2I7 perovskite for red color LEDs. Through increasing the annealing temperature of (C3H7NH3)2CsPb2I7 perovskite thin films, we have successfully achieved tunable emission wavelengths from 654 to 691 nm. Equally important, for all the quasi-2D perovskite LEDs, once the annealing temperature is fixed, the emission spectrum is independent of bias voltages, which is very important for their use in lighting and displays. With the analysis of the crystallinity, morphology, and thermodynamic stability of the quasi-2D perovskite, we find that the obtained (C3H7NH3)2CsPb2I7 perovskite is a single-phase quasi-2D perovskite with only n = 2 phase. Besides, we found that the red shifting of emission wavelength is caused by the increase of perovskite crystal size while increasing the annealing temperature. Our results also show that the temperature-induced color tunability can be applied to a series of quasi-2D perovskites with different alkylammonium cations. Importantly, we find that short alkylammonium spacers offer better electrical properties for efficient current transport and high performance in LED applications. This work contributes to controlling the optoelectronic properties of quasi-2D perovskites via controlling their crystal growth as well as paves the way to realize practical lighting and display applications of perovskite LEDs.-
dc.languageeng-
dc.publisherRSC Publications. The Journal's web site is located at http://pubs.rsc.org/en/journals/journalissues/nr#!recentarticles&all-
dc.relation.ispartofNanoscale-
dc.subjectAlkylammonium cations-
dc.subjectAnnealing temperatures-
dc.subjectDisplay application-
dc.subjectEmission spectrums-
dc.subjectEmission wavelength-
dc.titleSingle-phase alkylammonium cesium lead iodide quasi-2D perovskites for color-tunable and spectrum-stable red LEDs-
dc.typeArticle-
dc.identifier.emailChoy, WCH: chchoy@eee.hku.hk-
dc.identifier.authorityChoy, WCH=rp00218-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1039/C9NR02706H-
dc.identifier.pmid31490477-
dc.identifier.scopuseid_2-s2.0-85072508387-
dc.identifier.scopuseid_2-s2.0-85072508387-
dc.identifier.hkuros315692-
dc.identifier.volume11-
dc.identifier.issue36-
dc.identifier.spage16907-
dc.identifier.epage16918-
dc.publisher.placeUnited Kingdom-

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