Realizing full-color perovskite quantum dots light-emitting diodes via contemporary surface ligand/anion engineering. (December 2022)

• Record Type: Journal Article
• Authors: He, S.; Lee, H.B.; Kumar, N.; Ko, K.-J.; Song, M.; Kim, W.; Kang, J.-W.
• Is Part Of: Materials today chemistry. Volume 26(2022)
• Publication Date: 2022-12
• Subjects: Full-color displays -- Anion exchange -- Color tunability -- Photoluminescence -- Electroluminescence; Chemistry -- Periodicals; Materials -- Research -- Periodicals; Materials science -- Periodicals; Chemistry; Materials -- Research; Electronic journals; Periodicals; 660.282
• DOI: 10.1016/j.mtchem.2022.101012
• Languages: English
• ISSNs: 2468-5194

Abstract

Abstract: Unprecedentedly, cesium lead halide (CsPbX3, X = Cl, Br, I) quantum dots (QDs) with tunable spectral emissions and photophysical properties are used as a common emissive material for the fabrication of full-color perovskite QDs light-emitting diodes. An efficient, non-destructive ligand/anion exchange strategy is developed to fine-tune the optical properties of CsPbBr3 QDs solid-state films. Specifically, the surface of the CsPbBr3 QDs films is passivated by phenethylammonium halides, PEAX (X = Cl, Br, I) salts via a facile spin-coating technique, producing PEAX-CsPbBr3 QDs (X = Cl, Br, I) films with tunable (blue/green/red) color emissions that cover the entire visible spectrum. During passivation treatment, the PEAX passivators supply additional halide (Cl, Br, I) anions to fill in the intrinsic Br vacancies, allowing contemporary defect-passivation and emission-tuning effect in the QDs film. More importantly, this surface passivation strategy enables the fabrication of full-color perovskite QDs light-emitting diodes using PEAX-CsPbBr3 QDs as a common emissive film. Graphical abstract: Short-chained, aromatic phenethylammonium halide, PEAX (X = Cl, Br, I) salts are passivated on the surface of CsPbBr3 QDs films via facile spin-coating, producing PEAX-CsPbBr3 QDs films with tunable (blue, green, red) color emissions. This surface passivation enables the fabrication of blue-, green-, and red-perovskite QDs light-emitting diodes (PeQLEDs), using PEAX-CsPbBr3 QDs as a common emissive film. Image 1 Highlights: CsPbBr3 quantum dots (QDs) are synthesized by typical hot-injection method. CsPbBr3 QDs films are passivated using phenethylammonium halide (PEAX, X = Cl, Br, I) via facile spin-coating technique. PEAX (X = Cl, Br, I) passivation of CsPbBr3 produces PEAX-CsPbBr3 QDs with tunable (blue, green, red) emission. PEAX (X = Cl, Br, I) passivation of CsPbBr3 enables the fabrication of full-color displays.