Water-induced high-performance quantum-dot light-emitting diodes
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866909307494203392 |
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| author | Jin, Wangxiao He, Siyu Lu, Xiuyuan Zhu, Xitong Liu, Dijiong Sun, Guolong Hao, Yanlei Yan, Xiaolin Yan, Yiran Wu, Longjia Lin, Xiongfeng Hou, Wenjun Cao, Weiran Liu, Chuan Liang, Xiaoci Gao, Yuan Deng, Yunzhou Gao, Feng Jin, Yizheng |
| author_facet | Jin, Wangxiao He, Siyu Lu, Xiuyuan Zhu, Xitong Liu, Dijiong Sun, Guolong Hao, Yanlei Yan, Xiaolin Yan, Yiran Wu, Longjia Lin, Xiongfeng Hou, Wenjun Cao, Weiran Liu, Chuan Liang, Xiaoci Gao, Yuan Deng, Yunzhou Gao, Feng Jin, Yizheng |
| contents | Solution-processed light-emitting diodes (LEDs) are appealing for their potential in the low-cost fabrication of large-area devices. However, the limited performance of solution-processed blue LEDs, particularly their short operation lifetime, is hindering their practical use in display technologies. Here, we demonstrate that trace water in device, previously considered detrimental to most solution-processed LEDs, dramatically enhances the performance of quantum-dot LEDs (QLEDs). This breakthrough stems from our comprehensive mechanism investigations into the positive ageing phenomenon, a long-standing puzzle in the QLED field. Our findings reveal that water passivation on the surface of electron-transport layers, which are composed of zinc-oxide-based nanoparticles, improves charge transport and enhances exciton radiative recombination during device operation. Combined with the advanced top-emitting architecture, our blue QLEDs achieve a high current efficiency of 35.5 cd A-1, a blue index (colour coordinate corrected current efficiency) of over 470 cd A-1 CIEy-1, and unprecedented stability, with an extrapolated T95 lifetime (at an initial brightness of 1,000 cd m-2) of 287 hours. Our work may inspire further exploration into surface passivation of nanocrystalline functional layers, critical for the advancement of emerging solution-processed optoelectronic and electronic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2409_04283 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Water-induced high-performance quantum-dot light-emitting diodes Jin, Wangxiao He, Siyu Lu, Xiuyuan Zhu, Xitong Liu, Dijiong Sun, Guolong Hao, Yanlei Yan, Xiaolin Yan, Yiran Wu, Longjia Lin, Xiongfeng Hou, Wenjun Cao, Weiran Liu, Chuan Liang, Xiaoci Gao, Yuan Deng, Yunzhou Gao, Feng Jin, Yizheng Optics Applied Physics Solution-processed light-emitting diodes (LEDs) are appealing for their potential in the low-cost fabrication of large-area devices. However, the limited performance of solution-processed blue LEDs, particularly their short operation lifetime, is hindering their practical use in display technologies. Here, we demonstrate that trace water in device, previously considered detrimental to most solution-processed LEDs, dramatically enhances the performance of quantum-dot LEDs (QLEDs). This breakthrough stems from our comprehensive mechanism investigations into the positive ageing phenomenon, a long-standing puzzle in the QLED field. Our findings reveal that water passivation on the surface of electron-transport layers, which are composed of zinc-oxide-based nanoparticles, improves charge transport and enhances exciton radiative recombination during device operation. Combined with the advanced top-emitting architecture, our blue QLEDs achieve a high current efficiency of 35.5 cd A-1, a blue index (colour coordinate corrected current efficiency) of over 470 cd A-1 CIEy-1, and unprecedented stability, with an extrapolated T95 lifetime (at an initial brightness of 1,000 cd m-2) of 287 hours. Our work may inspire further exploration into surface passivation of nanocrystalline functional layers, critical for the advancement of emerging solution-processed optoelectronic and electronic devices. |
| title | Water-induced high-performance quantum-dot light-emitting diodes |
| topic | Optics Applied Physics |
| url | https://arxiv.org/abs/2409.04283 |