Nature Communications
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2024
·Vol. 15
·期 1
·1-8
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IF 14.7
Li Mengqi,Li Rui,Wu Longjia,Lin Xiongfeng,Xia Xueqing,Ao Zitong,Sun Xiaojuan,Chen Xingtong,Chen Song
Top emission can enhance luminance, color purity, and panel-manufacturing compatibility for emissive displays. Still, top-emitting quantum-dot light-emitting diodes (QLEDs) suffer from poor stability, low light outcoupling, and non-negligible viewing-angle dependence because, for QLEDs with non-red emission, the electrically optimum device structure is incompatible with single-mode optical microcavity. Here, we demonstrate that by improving the way of determining reflection penetration depths and creating refractive-index-lowering processes, the issues faced by green QLEDs can be overcome. This leads to advanced device performance, including a luminance exceeding 1.6 million nits, a current efficiency of 204.2 cd A −1 , and a T 95 operational lifetime of 15,600 hours at 1000 nits. Meanwhile, our design does not compromise light outcoupling as it offers an external quantum efficiency of 29.2% without implementing light extraction methods. Lastly, an angular color shift of Δ u’v’ = 0.0052 from 0° to 60° is achieved by narrowing the emission linewidth of quantum dots.
研究领域:
材料科学
·
光学工程
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高影响因子
Nature Photonics
·
2025
·
IF 32.9
Jin Wangxiao,He Siyu,Lu Xiuyuan,Zhu Xitong,Liu Dijiong,Sun Guolong,Hao Yanlei,Chen Zuyan,Wang Chenyang,Zeng Jiejun,Zheng Zhi,Yan Xiaolin,Yan Yiran,Wu Longjia,Lin Xiongfeng,Hou Wenjun,Cao Weiran,Liu Chuan,Liang Xiaoci,Gao Yuan,Deng Yunzhou,Cao Kaisheng,Yang Yingguo,Gao Feng,Jin Yizheng
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 the device—previously considered detrimental to most solution-processed LEDs—dramatically enhances the performance of quantum-dot LEDs. This breakthrough stems from our comprehensive mechanism investigations into the positive aging phenomenon, a long-standing puzzle in the quantum-dot LED field. Our findings reveal that water passivation on the surface of electron-transporting layers, which are composed of zinc-oxide-based nanoparticles, improves charge transport and enhances exciton radiative recombination by suppressing hole leakage during device operation. Combined with the advanced top-emitting architecture, our blue quantum-dot LEDs achieve a high current efficiency of 37.1 cd A −1 , a blue index (colour-coordinate-corrected current efficiency) of over 490 cd A −1 \({{\rm{CIE}}}_{y}^{-1}\) and unprecedented stability, with an extrapolated T 95 lifetime (at an initial brightness of 1,000 cd m −2 ) of 287 h. 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.
研究领域:
光电子学
·
纳米技术
·
材料科学
·
半导体器件
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高影响因子
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