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Short-branched alkyl sulfobetaine-passivated CsPbBr 3 nanocrystals for efficient green light emitting diodes.
- Source :
-
Nanoscale [Nanoscale] 2024 Apr 18; Vol. 16 (15), pp. 7387-7395. Date of Electronic Publication: 2024 Apr 18. - Publication Year :
- 2024
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Abstract
- Inorganic cesium lead bromide nanocrystals (CsPbBr <subscript>3</subscript> NCs) hold promising prospects for high performance green light-emitting diodes (LEDs) due to their exceptional color purity and high luminescence efficiency. However, the common ligands employed for passivating these indispensable NCs, such as long-chain organic ligands like oleic acid and oleylamine (OA/OAm), display highly dynamic binding and electronic insulating issues, thereby resulting in a low efficiency of the as-fabricated LEDs. Herein, we report a new zwitterionic short-branched alkyl sulfobetaine ligand, namely trioctyl(propyl-3-sulfonate) ammonium betaine (TOAB), to in situ passivate CsPbBr <subscript>3</subscript> NCs via a feasible one-step solution synthesis, enabling efficiency improvement of CsPbBr <subscript>3</subscript> NC-based LEDs. The zwitterionic TOAB ligand not only strengthened the surface passivation of CsPbBr <subscript>3</subscript> NCs with a high photoluminescence quantum yield (PLQY) of 97%, but also enhanced the carrier transport in the fabricated CsPbBr <subscript>3</subscript> NC thin films due to the short-branched alkyl design. Consequently, CsPbBr <subscript>3</subscript> NCs passivated with TOAB achieved a green LED with an external quantum efficiency (EQE) of 7.3% and a maximum luminance of 5716 cd m <superscript>-2</superscript> , surpassing those of LEDs based on insulating long-chain ligand-passivated NCs. Our work provides an effective surface passivation ligand design to enhance the performance of CsPbBr <subscript>3</subscript> NC-based LEDs.
Details
- Language :
- English
- ISSN :
- 2040-3372
- Volume :
- 16
- Issue :
- 15
- Database :
- MEDLINE
- Journal :
- Nanoscale
- Publication Type :
- Academic Journal
- Accession number :
- 38545886
- Full Text :
- https://doi.org/10.1039/d4nr00965g