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Song, Myoung Hoon
Organic Photonics & Optoelectronics Lab.
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dc.citation.number 25 -
dc.citation.startPage 6689 -
dc.citation.title ENERGIES -
dc.citation.volume 13 - Park, Jong Hyun - Jang, Chung Hyeon - Jung, Eie Dae - Lee, Seungjin - Song, Myoung Hoon - Lee, Bo Ram - 2023-12-21T16:39:04Z - 2023-12-21T16:39:04Z - 2020-12-18 - 2020-12 -
dc.description.abstract Metal halide perovskites have been investigated for the next-generation light-emitting materials because of their advantages such as high photoluminescence quantum yield (PLQY), excellent color purity, and facile color tunability. Recently, red- and green-emissive perovskite light-emitting diodes (PeLEDs) have shown an external quantum efficiency (EQE) of over 20%, whereas there is still room for improvement for blue emissive PeLEDs. By controlling the halide compositions of chloride (Cl-) and bromide (Br-), the bandgap of perovskites can be easily tuned for blue emission. However, halide segregation easily occurrs in the mixed-halide perovskite under light irradiation and LED operation because of poor phase stability. Here, we explore the effect of A-site cation engineering on the phase stability of the mixed-halide perovskites and find that a judicious selection of low dipole moment A cation (formamidinium or cesium) suppresses the halide segregation. This enables efficient bandgap tuning and electroluminescence stability for sky blue emissive PeLEDs over the current density of 15 mA/cm(2). -
dc.identifier.bibliographicCitation ENERGIES, v.13, no.25, pp.6689 -
dc.identifier.doi 10.3390/en13246689 -
dc.identifier.issn 1996-1073 -
dc.identifier.scopusid 2-s2.0-85106571544 -
dc.identifier.uri -
dc.identifier.url -
dc.identifier.wosid 000602888000001 -
dc.language 영어 -
dc.publisher MDPI -
dc.title A-Site Cation Engineering for Efficient Blue-Emissive Perovskite Light-Emitting Diodes -
dc.type Article -
dc.description.isOpenAccess TRUE -
dc.relation.journalWebOfScienceCategory Energy & Fuels -
dc.relation.journalResearchArea Energy & Fuels -
dc.type.docType Article -
dc.description.journalRegisteredClass scie -
dc.description.journalRegisteredClass scopus -
dc.subject.keywordAuthor perovskite light-emitting diodes -
dc.subject.keywordAuthor blue emission -
dc.subject.keywordAuthor device stability -
dc.subject.keywordAuthor A-site cation -
dc.subject.keywordAuthor halide segregation -
dc.subject.keywordPlus PERFORMANCE -


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