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Article: Hole Transport Bilayer Structure for Quasi‐2D Perovskite Based Blue Light‐Emitting Diodes with High Brightness and Good Spectral Stability

TitleHole Transport Bilayer Structure for Quasi‐2D Perovskite Based Blue Light‐Emitting Diodes with High Brightness and Good Spectral Stability
Authors
Keywordsblue perovskite LEDs
carrier transport layer
high luminance
quasi‐2D perovskite
turn‐on voltage
Issue Date2019
PublisherWiley - VCH Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/afm
Citation
Advanced Functional Materials, 2019, v. 29 n. 43, p. article no. 1905339 How to Cite?
AbstractSubstantial achievements have been made in green and red perovskite light emitting diodes (PeLEDs) recently. However, blue PeLEDs still lag behind with much lower performances. One of the main reasons is the mass undesirable nonradiative recombination at interfaces and within the perovskite films. In this work, an efficient hole transport bi‐layer structure composed of PSSNa and NiOx is demonstrated to simultaneously inhibit the nonradiative decays between NiOx and perovskite films by reducing NiOx surface defects and improving quasi‐2D perovskite thin film quality by minimizing its pin‐holes and reducing the film roughness. The results show that the dipole feature of PSSNa improves the hole transportation and thus PeLED performances. Moreover, by introducing KBr into the perovskite, its film quality improves and trap states reduce. Eventually, the blue PeLEDs is achieved with a very low turn‐on voltage of 3.31 V accompanied with an external quantum efficiency of 1.45% and a remarkable luminance of 4359 cd m‐2. With further optimization of the perovskite precursor concentration, the highest luminance reaches 5737 cd m‐2, which represents the brightest blue PeLEDs reported to date as far as it is known. Furthermore, the devices also show better spectral stability and operation lifetime as compared to other blue PeLEDs.
Persistent Identifierhttp://hdl.handle.net/10722/287618
ISSN
2019 Impact Factor: 16.836
2015 SCImago Journal Rankings: 5.210

 

DC FieldValueLanguage
dc.contributor.authorRen, Z-
dc.contributor.authorXIAO, X-
dc.contributor.authorMA, R-
dc.contributor.authorLIN, H-
dc.contributor.authorWang, K-
dc.contributor.authorSun, XW-
dc.contributor.authorChoy, WCH-
dc.date.accessioned2020-10-05T12:00:44Z-
dc.date.available2020-10-05T12:00:44Z-
dc.date.issued2019-
dc.identifier.citationAdvanced Functional Materials, 2019, v. 29 n. 43, p. article no. 1905339-
dc.identifier.issn1616-301X-
dc.identifier.urihttp://hdl.handle.net/10722/287618-
dc.description.abstractSubstantial achievements have been made in green and red perovskite light emitting diodes (PeLEDs) recently. However, blue PeLEDs still lag behind with much lower performances. One of the main reasons is the mass undesirable nonradiative recombination at interfaces and within the perovskite films. In this work, an efficient hole transport bi‐layer structure composed of PSSNa and NiOx is demonstrated to simultaneously inhibit the nonradiative decays between NiOx and perovskite films by reducing NiOx surface defects and improving quasi‐2D perovskite thin film quality by minimizing its pin‐holes and reducing the film roughness. The results show that the dipole feature of PSSNa improves the hole transportation and thus PeLED performances. Moreover, by introducing KBr into the perovskite, its film quality improves and trap states reduce. Eventually, the blue PeLEDs is achieved with a very low turn‐on voltage of 3.31 V accompanied with an external quantum efficiency of 1.45% and a remarkable luminance of 4359 cd m‐2. With further optimization of the perovskite precursor concentration, the highest luminance reaches 5737 cd m‐2, which represents the brightest blue PeLEDs reported to date as far as it is known. Furthermore, the devices also show better spectral stability and operation lifetime as compared to other blue PeLEDs.-
dc.languageeng-
dc.publisherWiley - VCH Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/afm-
dc.relation.ispartofAdvanced Functional 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 perovskite LEDs-
dc.subjectcarrier transport layer-
dc.subjecthigh luminance-
dc.subjectquasi‐2D perovskite-
dc.subjectturn‐on voltage-
dc.titleHole Transport Bilayer Structure for Quasi‐2D Perovskite Based Blue Light‐Emitting Diodes with High Brightness and Good Spectral Stability-
dc.typeArticle-
dc.identifier.emailRen, Z: zhwren@hku.hk-
dc.identifier.emailChoy, WCH: chchoy@eee.hku.hk-
dc.identifier.authorityChoy, WCH=rp00218-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/adfm.201905339-
dc.identifier.scopuseid_2-s2.0-85070807874-
dc.identifier.hkuros315693-
dc.identifier.volume29-
dc.identifier.issue43-
dc.identifier.spagearticle no. 1905339-
dc.identifier.epagearticle no. 1905339-
dc.publisher.placeGermany-

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