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Article: Spontaneous Formation of Nanocrystals in Amorphous Matrix: Alternative Pathway to Bright Emission in Quasi‐2D Perovskites

TitleSpontaneous Formation of Nanocrystals in Amorphous Matrix: Alternative Pathway to Bright Emission in Quasi‐2D Perovskites
Authors
Keywordslight emitting diodes
photoluminescence
Ruddlesden–Popper perovskites
organic–inorganic halide perovskites
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, v. 7 n. 19, p. article no. 190026 How to Cite?
AbstractSignificant enhancement of the light emission in Ruddlesden–Popper organic–inorganic halide perovskites is obtained by antisolvent induced spontaneous formation of nanocrystals in an amorphous matrix. This morphology change results in the passivation of defects and significant enhancement of light emission and 16 times higher photoluminescence quantum yield (PLQY), and it is applicable to different spacer cations. The use of trioctylphosphine oxide results in further defect passivation leading to an increase in PLQY (≈2.3 times), the suppression of lower energy emission in low temperature photoluminescence spectra, the dominance of radiative recombination, and the disappearance of thermal quenching of the luminescence. The proposed method offers a reproducible, controllable, and antisolvent‐insensitive alternative to energy landscape engineering to utilize energy funneling phenomenon to achieve bright emission. Instead of facilitating fast energy transfer from lower to higher number of perovskite sheets to prevent nonradiative losses, it is demonstrated that defects can be effectively passivated via morphology control and the use of a passivating agent, so that bright emission can be obtained from single phase nanocrystals embedded in amorphous matrix, resulting in light emitting diodes with a maximum external quantum efficiency of 2.25%.
Persistent Identifierhttp://hdl.handle.net/10722/279388
ISSN
2017 Impact Factor: 7.43
2015 SCImago Journal Rankings: 2.488

 

DC FieldValueLanguage
dc.contributor.authorLiu, F-
dc.contributor.authorChan, CCS-
dc.contributor.authorMa, C-
dc.contributor.authorTAM, HW-
dc.contributor.authorLeung, TL-
dc.contributor.authorLin, J-
dc.contributor.authorDjurisic, AB-
dc.contributor.authorWong, KS-
dc.contributor.authorPopović, J-
dc.contributor.authorNg, AMC-
dc.contributor.authorChan, WK-
dc.contributor.authorChen, W-
dc.contributor.authorHe, Z-
dc.contributor.authorAdesina, AE-
dc.contributor.authorFoo, Y-
dc.contributor.authorZapien, JA-
dc.date.accessioned2019-11-01T07:16:22Z-
dc.date.available2019-11-01T07:16:22Z-
dc.date.issued2019-
dc.identifier.citationAdvanced Optical Materials, 2019, v. 7 n. 19, p. article no. 190026-
dc.identifier.issn2195-1071-
dc.identifier.urihttp://hdl.handle.net/10722/279388-
dc.description.abstractSignificant enhancement of the light emission in Ruddlesden–Popper organic–inorganic halide perovskites is obtained by antisolvent induced spontaneous formation of nanocrystals in an amorphous matrix. This morphology change results in the passivation of defects and significant enhancement of light emission and 16 times higher photoluminescence quantum yield (PLQY), and it is applicable to different spacer cations. The use of trioctylphosphine oxide results in further defect passivation leading to an increase in PLQY (≈2.3 times), the suppression of lower energy emission in low temperature photoluminescence spectra, the dominance of radiative recombination, and the disappearance of thermal quenching of the luminescence. The proposed method offers a reproducible, controllable, and antisolvent‐insensitive alternative to energy landscape engineering to utilize energy funneling phenomenon to achieve bright emission. Instead of facilitating fast energy transfer from lower to higher number of perovskite sheets to prevent nonradiative losses, it is demonstrated that defects can be effectively passivated via morphology control and the use of a passivating agent, so that bright emission can be obtained from single phase nanocrystals embedded in amorphous matrix, resulting in light emitting diodes with a maximum external quantum efficiency of 2.25%.-
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.subjectlight emitting diodes-
dc.subjectphotoluminescence-
dc.subjectRuddlesden–Popper perovskites-
dc.subjectorganic–inorganic halide perovskites-
dc.titleSpontaneous Formation of Nanocrystals in Amorphous Matrix: Alternative Pathway to Bright Emission in Quasi‐2D Perovskites-
dc.typeArticle-
dc.identifier.emailLiu, F: liufz@hku.hk-
dc.identifier.emailLeung, TL: peterltl@HKUCC-COM.hku.hk-
dc.identifier.emailDjurisic, AB: dalek@hku.hk-
dc.identifier.emailChan, WK: waichan@hku.hk-
dc.identifier.authorityDjurisic, AB=rp00690-
dc.identifier.authorityChan, WK=rp00667-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/adom.201900269-
dc.identifier.scopuseid_2-s2.0-85067881756-
dc.identifier.hkuros308601-
dc.identifier.volume7-
dc.identifier.issue19-
dc.identifier.spagearticle no. 190026-
dc.identifier.epagearticle no. 190026-
dc.publisher.placeGermany-

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