Ligand-Enhanced Neodymium Doping of Perovskite Quantum Dots for Superior Exciton Confinement
In this study, all-inorganic perovskite quantum dots (QDs) for pure blue emission are explored for full-color displays. We prepared CsPbBr<sub>3</sub> and Cs<sub>3</sub>NdCl<sub>6</sub> QDs via hot injection methods and mixed in various ratios at room temperature...
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MDPI AG
2023-12-01
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| Online Access: | https://www.mdpi.com/1996-1944/16/24/7585 |
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| author | Xianghua Wang Lin Zhou Xudong Zhao Wenlong Ma Xinjun Wang |
| author_facet | Xianghua Wang Lin Zhou Xudong Zhao Wenlong Ma Xinjun Wang |
| author_sort | Xianghua Wang |
| collection | DOAJ |
| description | In this study, all-inorganic perovskite quantum dots (QDs) for pure blue emission are explored for full-color displays. We prepared CsPbBr<sub>3</sub> and Cs<sub>3</sub>NdCl<sub>6</sub> QDs via hot injection methods and mixed in various ratios at room temperature for color blending. Nd-doped CsPb(Cl/Br)<sub>3</sub> QDs showed a blueshift in emission, and the photoluminescence quantum yields (PLQY, Φ<sub>PL</sub>) were lower in the 460–470 nm range due to surface halogen and Cs vacancies. To address this, we introduced a silane molecule, APTMS, via a ligand exchange process, effectively repairing these vacancies and enhancing Nd doping into the lattice. This modification promotes the PLQY to 94% at 466 nm. Furthermore, combining these QDs with [1]Benzothieno[3,2-b][1]benzothiophene (BTBT), a conjugated small-molecule semiconductor, in a composite film reduced PLQY loss caused by FRET in solid-state QD films. This approach achieved a wide color gamut of 124% National Television System Committee (NTSC), using a UV LED backlight and RGB perovskite QDs in a BTBT-based organic matrix as the color conversion layer. Significantly, the photostability of this composite was enhanced when used as a color conversion layer (CCL) under blue-LED excitation. |
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| format | Article |
| id | doaj.art-52406e0e24c2476981fb695444f9bf68 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-08T20:33:46Z |
| publishDate | 2023-12-01 |
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| series | Materials |
| spelling | doaj.art-52406e0e24c2476981fb695444f9bf682023-12-22T14:22:43ZengMDPI AGMaterials1996-19442023-12-011624758510.3390/ma16247585Ligand-Enhanced Neodymium Doping of Perovskite Quantum Dots for Superior Exciton ConfinementXianghua Wang0Lin Zhou1Xudong Zhao2Wenlong Ma3Xinjun Wang4Special Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, ChinaSpecial Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, ChinaSpecial Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, ChinaSpecial Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, ChinaSpecial Display and Imaging Technology Innovation Center of Anhui Province, Academy of Opto-Electric Technology, School of Instrument Science and Optoelectronics Engineering, Hefei University of Technology, Hefei 230009, ChinaIn this study, all-inorganic perovskite quantum dots (QDs) for pure blue emission are explored for full-color displays. We prepared CsPbBr<sub>3</sub> and Cs<sub>3</sub>NdCl<sub>6</sub> QDs via hot injection methods and mixed in various ratios at room temperature for color blending. Nd-doped CsPb(Cl/Br)<sub>3</sub> QDs showed a blueshift in emission, and the photoluminescence quantum yields (PLQY, Φ<sub>PL</sub>) were lower in the 460–470 nm range due to surface halogen and Cs vacancies. To address this, we introduced a silane molecule, APTMS, via a ligand exchange process, effectively repairing these vacancies and enhancing Nd doping into the lattice. This modification promotes the PLQY to 94% at 466 nm. Furthermore, combining these QDs with [1]Benzothieno[3,2-b][1]benzothiophene (BTBT), a conjugated small-molecule semiconductor, in a composite film reduced PLQY loss caused by FRET in solid-state QD films. This approach achieved a wide color gamut of 124% National Television System Committee (NTSC), using a UV LED backlight and RGB perovskite QDs in a BTBT-based organic matrix as the color conversion layer. Significantly, the photostability of this composite was enhanced when used as a color conversion layer (CCL) under blue-LED excitation.https://www.mdpi.com/1996-1944/16/24/7585excitonquantum dotsexciton binding energyzeta potentialFörster resonance energy transfernanostrain |
| spellingShingle | Xianghua Wang Lin Zhou Xudong Zhao Wenlong Ma Xinjun Wang Ligand-Enhanced Neodymium Doping of Perovskite Quantum Dots for Superior Exciton Confinement Materials exciton quantum dots exciton binding energy zeta potential Förster resonance energy transfer nanostrain |
| title | Ligand-Enhanced Neodymium Doping of Perovskite Quantum Dots for Superior Exciton Confinement |
| title_full | Ligand-Enhanced Neodymium Doping of Perovskite Quantum Dots for Superior Exciton Confinement |
| title_fullStr | Ligand-Enhanced Neodymium Doping of Perovskite Quantum Dots for Superior Exciton Confinement |
| title_full_unstemmed | Ligand-Enhanced Neodymium Doping of Perovskite Quantum Dots for Superior Exciton Confinement |
| title_short | Ligand-Enhanced Neodymium Doping of Perovskite Quantum Dots for Superior Exciton Confinement |
| title_sort | ligand enhanced neodymium doping of perovskite quantum dots for superior exciton confinement |
| topic | exciton quantum dots exciton binding energy zeta potential Förster resonance energy transfer nanostrain |
| url | https://www.mdpi.com/1996-1944/16/24/7585 |
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