Synergistic Halide- and Ligand-Exchanges of All-Inorganic Perovskite Nanocrystals for Near-Unity and Spectrally Stable Red Emission
All-inorganic perovskite nanocrystals (NCs) of CsPbX<sub>3</sub> (X = Cl, Br, I) are promising for displays due to wide color gamut, narrow emission bandwidth, and high photoluminescence quantum yield (PLQY). However, pure red perovskite NCs prepared by mixing halide ions often result in...
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MDPI AG
2023-08-01
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| Online Access: | https://www.mdpi.com/2079-4991/13/16/2337 |
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| author | Kaiwang Chen Dengliang Zhang Qing Du Wei Hong Yue Liang Xingxing Duan Shangwei Feng Linfeng Lan Lei Wang Jiangshan Chen Dongge Ma |
| author_facet | Kaiwang Chen Dengliang Zhang Qing Du Wei Hong Yue Liang Xingxing Duan Shangwei Feng Linfeng Lan Lei Wang Jiangshan Chen Dongge Ma |
| author_sort | Kaiwang Chen |
| collection | DOAJ |
| description | All-inorganic perovskite nanocrystals (NCs) of CsPbX<sub>3</sub> (X = Cl, Br, I) are promising for displays due to wide color gamut, narrow emission bandwidth, and high photoluminescence quantum yield (PLQY). However, pure red perovskite NCs prepared by mixing halide ions often result in defects and spectral instabilities. We demonstrate a method to prepare stable pure red emission and high-PLQY-mixed-halide perovskite NCs through simultaneous halide-exchange and ligand-exchange. CsPbBr<sub>3</sub> NCs with surface organic ligands are first synthesized using the ligand-assisted reprecipitation (LARP) method, and then ZnI<sub>2</sub> is introduced for anion exchange to transform CsPbBr<sub>3</sub> to CsPbBr<sub>x</sub>I<sub>3−x</sub> NCs. ZnI<sub>2</sub> not only provides iodine ions but also acts as an inorganic ligand to passivate surface defects and prevent ion migration, suppressing non-radiative losses and halide segregation. The luminescence properties of CsPbBr<sub>x</sub>I<sub>3−x</sub> NCs depend on the ZnI<sub>2</sub> content. By regulating the ZnI<sub>2</sub> exchange process, red CsPbBr<sub>x</sub>I<sub>3−x</sub> NCs with organic/inorganic hybrid ligands achieve near-unity PLQY with a stable emission peak at 640 nm. The CsPbBr<sub>x</sub>I<sub>3−x</sub> NCs can be combined with green CsPbBr<sub>3</sub> NCs to construct white light-emitting diodes with high-color gamut. Our work presents a facile ion exchange strategy for preparing spectrally stable mixed-halide perovskite NCs with high PLQY, approaching the efficiency limit for display or lighting applications. |
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| language | English |
| last_indexed | 2024-03-10T23:41:59Z |
| publishDate | 2023-08-01 |
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| spelling | doaj.art-d6d754d78fb64a83b2248c404407dfb42023-11-19T02:27:34ZengMDPI AGNanomaterials2079-49912023-08-011316233710.3390/nano13162337Synergistic Halide- and Ligand-Exchanges of All-Inorganic Perovskite Nanocrystals for Near-Unity and Spectrally Stable Red EmissionKaiwang Chen0Dengliang Zhang1Qing Du2Wei Hong3Yue Liang4Xingxing Duan5Shangwei Feng6Linfeng Lan7Lei Wang8Jiangshan Chen9Dongge Ma10Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, ChinaInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, ChinaInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, ChinaInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, ChinaInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, ChinaInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, ChinaInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, ChinaInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, ChinaWuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, ChinaInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, ChinaInstitute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Luminescence from Molecular Aggregates, South China University of Technology, Guangzhou 510640, ChinaAll-inorganic perovskite nanocrystals (NCs) of CsPbX<sub>3</sub> (X = Cl, Br, I) are promising for displays due to wide color gamut, narrow emission bandwidth, and high photoluminescence quantum yield (PLQY). However, pure red perovskite NCs prepared by mixing halide ions often result in defects and spectral instabilities. We demonstrate a method to prepare stable pure red emission and high-PLQY-mixed-halide perovskite NCs through simultaneous halide-exchange and ligand-exchange. CsPbBr<sub>3</sub> NCs with surface organic ligands are first synthesized using the ligand-assisted reprecipitation (LARP) method, and then ZnI<sub>2</sub> is introduced for anion exchange to transform CsPbBr<sub>3</sub> to CsPbBr<sub>x</sub>I<sub>3−x</sub> NCs. ZnI<sub>2</sub> not only provides iodine ions but also acts as an inorganic ligand to passivate surface defects and prevent ion migration, suppressing non-radiative losses and halide segregation. The luminescence properties of CsPbBr<sub>x</sub>I<sub>3−x</sub> NCs depend on the ZnI<sub>2</sub> content. By regulating the ZnI<sub>2</sub> exchange process, red CsPbBr<sub>x</sub>I<sub>3−x</sub> NCs with organic/inorganic hybrid ligands achieve near-unity PLQY with a stable emission peak at 640 nm. The CsPbBr<sub>x</sub>I<sub>3−x</sub> NCs can be combined with green CsPbBr<sub>3</sub> NCs to construct white light-emitting diodes with high-color gamut. Our work presents a facile ion exchange strategy for preparing spectrally stable mixed-halide perovskite NCs with high PLQY, approaching the efficiency limit for display or lighting applications.https://www.mdpi.com/2079-4991/13/16/2337perovskite nanocrystalsligand assisted reprecipitationhalide-exchangeligand-exchangepure red emission |
| spellingShingle | Kaiwang Chen Dengliang Zhang Qing Du Wei Hong Yue Liang Xingxing Duan Shangwei Feng Linfeng Lan Lei Wang Jiangshan Chen Dongge Ma Synergistic Halide- and Ligand-Exchanges of All-Inorganic Perovskite Nanocrystals for Near-Unity and Spectrally Stable Red Emission Nanomaterials perovskite nanocrystals ligand assisted reprecipitation halide-exchange ligand-exchange pure red emission |
| title | Synergistic Halide- and Ligand-Exchanges of All-Inorganic Perovskite Nanocrystals for Near-Unity and Spectrally Stable Red Emission |
| title_full | Synergistic Halide- and Ligand-Exchanges of All-Inorganic Perovskite Nanocrystals for Near-Unity and Spectrally Stable Red Emission |
| title_fullStr | Synergistic Halide- and Ligand-Exchanges of All-Inorganic Perovskite Nanocrystals for Near-Unity and Spectrally Stable Red Emission |
| title_full_unstemmed | Synergistic Halide- and Ligand-Exchanges of All-Inorganic Perovskite Nanocrystals for Near-Unity and Spectrally Stable Red Emission |
| title_short | Synergistic Halide- and Ligand-Exchanges of All-Inorganic Perovskite Nanocrystals for Near-Unity and Spectrally Stable Red Emission |
| title_sort | synergistic halide and ligand exchanges of all inorganic perovskite nanocrystals for near unity and spectrally stable red emission |
| topic | perovskite nanocrystals ligand assisted reprecipitation halide-exchange ligand-exchange pure red emission |
| url | https://www.mdpi.com/2079-4991/13/16/2337 |
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