Reduced Energetic Disorders in Dion–Jacobson Perovskites for Efficient and Spectral Stable Blue LEDs
Abstract: Metal halide perovskites have witnessed great success in green, red, and near‐infrared light‐emitting diodes (LEDs), yet blue LEDs still lag behind. Reducing undesired energetic disorders – broad n‐phases and halide segregation – is considered as the most critical strategy to further improve the performances. Here, the study reports a newly designed and synthesized di‐ammonium ligand with rigid π‐conjugated rings and additional methyl groups to construct Dion–Jacobson (DJ) structure. Augmented coordination from the extra ammonium site and increased effective bulkiness from methyl groups lead to better distribution control over conventional mono‐ammonium ligands. This enhances the radiative recombination of blue emissions in the film with homogeneous energy landscape and improved surface morphology, as evidenced by a series of imaging and mapping techniques. As a result, it demonstrates DJ perovskite LEDs (PeLEDs) with peak external quantum efficiencies of ≈4% at 484 nm and ≈11% at 494 nm, which are among the top reported for pure DJ phase‐based PeLEDs in the corresponding wavelength regions. The results deepen the understanding of regulating energetic disorders in perovskite materials via molecular engineering.
- Standort
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Deutsche Nationalbibliothek Frankfurt am Main
- Umfang
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Online-Ressource
- Sprache
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Englisch
- Erschienen in
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Reduced Energetic Disorders in Dion–Jacobson Perovskites for Efficient and Spectral Stable Blue LEDs ; day:03 ; month:07 ; year:2023 ; extent:8
Advanced optical materials ; (03.07.2023) (gesamt 8)
- Urheber
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Seo, Jisung
Wang, Kang
Coffey, Aidan H.
He, Guiying
Yang, Hanjun
Lee, Yoon Ho
Ma, Ke
Sun, Jiaonan
Park, Jee Yung
Zhao, Han
Yuan, Chongli
Zhu, Chenhui
Sfeir, Matthew Y.
Dou, Letian
- DOI
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10.1002/adom.202301164
- URN
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urn:nbn:de:101:1-2023070415100928150053
- Rechteinformation
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Letzte Aktualisierung
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14.08.2025, 11:01 MESZ
Datenpartner
Deutsche Nationalbibliothek. Bei Fragen zum Objekt wenden Sie sich bitte an den Datenpartner.
Beteiligte
- Seo, Jisung
- Wang, Kang
- Coffey, Aidan H.
- He, Guiying
- Yang, Hanjun
- Lee, Yoon Ho
- Ma, Ke
- Sun, Jiaonan
- Park, Jee Yung
- Zhao, Han
- Yuan, Chongli
- Zhu, Chenhui
- Sfeir, Matthew Y.
- Dou, Letian
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