Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs
Abstract Perovskite quantum dots (PQDs) show promise in light-emitting diodes (LEDs). However, near-infrared (NIR) LEDs employing PQDs exhibit inferior external quantum efficiency related to the PQD emitting in the visible range. One fundamental issue arises from the PQDs dynamic surface: the ligand...
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| Format: | Article |
| Language: | English |
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Nature Publishing Group
2025-01-01
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| Series: | Light: Science & Applications |
| Online Access: | https://doi.org/10.1038/s41377-024-01704-x |
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| author | Zong-Shuo Liu Ye Wang Feng Zhao Hua-Hui Li Wei-Zhi Liu Wan-Shan Shen Hong-Wei Duan Ya-Kun Wang Liang-Sheng Liao |
| author_facet | Zong-Shuo Liu Ye Wang Feng Zhao Hua-Hui Li Wei-Zhi Liu Wan-Shan Shen Hong-Wei Duan Ya-Kun Wang Liang-Sheng Liao |
| author_sort | Zong-Shuo Liu |
| collection | DOAJ |
| description | Abstract Perovskite quantum dots (PQDs) show promise in light-emitting diodes (LEDs). However, near-infrared (NIR) LEDs employing PQDs exhibit inferior external quantum efficiency related to the PQD emitting in the visible range. One fundamental issue arises from the PQDs dynamic surface: the ligand loss and ions migration to the interfacial sites serve as quenching centers, resulting in trap-assisted recombination and carrier loss. In this work, we developed a chemical treatment strategy to eliminate the interface quenching sites and achieve high carrier utilization. We employ a bidentate and liquid agent (Formamidine thiocyanate, FASCN) with tight binding to suppress the ligand loss and the formation of interfacial quenching sites: the FASCN-treated films exhibit fourfold higher binding energy than the original oleate ligands. Furthermore, the short ligands (carbon chain <3) enable the treated films to show eightfold higher conductivity; and the liquid characteristics of FASCN avoid the use of high polar solvents and guarantee better passivation. The high conductivity ensures efficient charge transportation, enabling PQD-based NIR-LEDs to have a record-low voltage of 1.6 V at 776 nm. Furthermore, the champion EQE of the treated LEDs is ~23%: this is twofold higher than the control, and represents the highest among reported PQD-based NIR-LEDs. |
| format | Article |
| id | doaj-art-1f972fa7d9e84f54b78ba355ff7cdec8 |
| institution | Kabale University |
| issn | 2047-7538 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Nature Publishing Group |
| record_format | Article |
| series | Light: Science & Applications |
| spelling | doaj-art-1f972fa7d9e84f54b78ba355ff7cdec82025-01-12T12:40:23ZengNature Publishing GroupLight: Science & Applications2047-75382025-01-011411910.1038/s41377-024-01704-xLiquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDsZong-Shuo Liu0Ye Wang1Feng Zhao2Hua-Hui Li3Wei-Zhi Liu4Wan-Shan Shen5Hong-Wei Duan6Ya-Kun Wang7Liang-Sheng Liao8Institute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow UniversityInstitute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow UniversityInstitute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow UniversityInstitute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow UniversityInstitute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow UniversityInstitute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow UniversityInstitute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow UniversityInstitute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow UniversityInstitute of Functional Nano & Soft Materials (FUNSOM), Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Soochow UniversityAbstract Perovskite quantum dots (PQDs) show promise in light-emitting diodes (LEDs). However, near-infrared (NIR) LEDs employing PQDs exhibit inferior external quantum efficiency related to the PQD emitting in the visible range. One fundamental issue arises from the PQDs dynamic surface: the ligand loss and ions migration to the interfacial sites serve as quenching centers, resulting in trap-assisted recombination and carrier loss. In this work, we developed a chemical treatment strategy to eliminate the interface quenching sites and achieve high carrier utilization. We employ a bidentate and liquid agent (Formamidine thiocyanate, FASCN) with tight binding to suppress the ligand loss and the formation of interfacial quenching sites: the FASCN-treated films exhibit fourfold higher binding energy than the original oleate ligands. Furthermore, the short ligands (carbon chain <3) enable the treated films to show eightfold higher conductivity; and the liquid characteristics of FASCN avoid the use of high polar solvents and guarantee better passivation. The high conductivity ensures efficient charge transportation, enabling PQD-based NIR-LEDs to have a record-low voltage of 1.6 V at 776 nm. Furthermore, the champion EQE of the treated LEDs is ~23%: this is twofold higher than the control, and represents the highest among reported PQD-based NIR-LEDs.https://doi.org/10.1038/s41377-024-01704-x |
| spellingShingle | Zong-Shuo Liu Ye Wang Feng Zhao Hua-Hui Li Wei-Zhi Liu Wan-Shan Shen Hong-Wei Duan Ya-Kun Wang Liang-Sheng Liao Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs Light: Science & Applications |
| title | Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs |
| title_full | Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs |
| title_fullStr | Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs |
| title_full_unstemmed | Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs |
| title_short | Liquid bidentate ligand for full ligand coverage towards efficient near-infrared perovskite quantum dot LEDs |
| title_sort | liquid bidentate ligand for full ligand coverage towards efficient near infrared perovskite quantum dot leds |
| url | https://doi.org/10.1038/s41377-024-01704-x |
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