Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/140976
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dc.contributor.authorKulkarni, Sneha Avinashen_US
dc.contributor.authorMuduli, Subasen_US
dc.contributor.authorXing, Guichuanen_US
dc.contributor.authorYantara, Nataliaen_US
dc.contributor.authorLi, Mingjieen_US
dc.contributor.authorChen, Shien_US
dc.contributor.authorSum, Tze Chienen_US
dc.contributor.authorMathews, Nripanen_US
dc.contributor.authorWhite, Tim Jen_US
dc.contributor.authorMhaisalkar, Subodh Gautamen_US
dc.date.accessioned2020-06-03T05:05:35Z-
dc.date.available2020-06-03T05:05:35Z-
dc.date.issued2017-
dc.identifier.citationKulkarni, S. A., Muduli, S., Xing, G., Yantara, N., Li, M., Chen, S., . . . Mhaisalkar, S. G. (2017). Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes. ChemSusChem, 10(19), 3818-3824. doi:10.1002/cssc.201701067en_US
dc.identifier.issn1864-5631en_US
dc.identifier.urihttps://hdl.handle.net/10356/140976-
dc.description.abstractThe primary advantages of halide perovskites for light-emitting diodes (LEDs) are solution processability, direct band gap, good charge-carrier diffusion lengths, low trap density, and reasonable carrier mobility. The luminescence in 3 D halide perovskite thin films originates from free electron-hole bimolecular recombination. However, the slow bimolecular recombination rate is a fundamental performance limitation. Perovskite nanoparticles could result in improved performance but processability and cumbersome synthetic procedures remain challenges. Herein, these constraints are overcome by tailoring the 3 D perovskite as a near monodisperse nanoparticle film prepared through a one-step in situ deposition method. Replacing methyl ammonium bromide (CH3 NH3 Br, MABr) partially by octyl ammonium bromide [CH3 (CH2 )7 NH3 Br, OABr] in defined mole ratios in the perovskite precursor proved crucial for the nanoparticle formation. Films consisting of the in situ formed nanoparticles displayed signatures associated with excitonic recombination, rather than that of bimolecular recombination associated with 3 D perovskites. This transition was accompanied by enhanced photoluminescence quantum yield (PLQY≈20.5 % vs. 3.40 %). Perovskite LEDs fabricated from the nanoparticle films exhibit a one order of magnitude improvement in current efficiency and doubling in luminance efficiency. The material processing systematics derived from this study provides the means to control perovskite morphologies through the selection and mixing of appropriate additives.en_US
dc.description.sponsorshipNRF (Natl Research Foundation, S’pore)en_US
dc.description.sponsorshipMOE (Min. of Education, S’pore)en_US
dc.language.isoenen_US
dc.relation.ispartofChemSusChemen_US
dc.rightsThis is the accepted version of the following article: Kulkarni, S. A., Muduli, S., Xing, G., Yantara, N., Li, M., Chen, S., . . . Mhaisalkar, S. G. (2017). Modulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodes. ChemSusChem, 10(19), 3818-3824, which has been published in final form at dx.doi.org/10.1002/cssc.201701067. This article may be used for non-commercial purposes in accordance with the Wiley Self-Archiving Policy [https://authorservices.wiley.com/authorresources/Journal-Authors/licensing/self-archiving.html].en_US
dc.subjectEngineering::Materialsen_US
dc.titleModulating excitonic recombination effects through one-step synthesis of perovskite nanoparticles for light-emitting diodesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.researchEnergy Research Institute @ NTU (ERI@N)en_US
dc.identifier.doi10.1002/cssc.201701067-
dc.description.versionAccepted versionen_US
dc.identifier.pmid28834213-
dc.identifier.scopus2-s2.0-85029223776-
dc.identifier.issue19en_US
dc.identifier.volume10en_US
dc.identifier.spage3818en_US
dc.identifier.epage3824en_US
dc.subject.keywordsExciton Formationen_US
dc.subject.keywordsLight Emitting Diodesen_US
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item.grantfulltextopen-
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