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<p>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<sup>−1</sup>, a blue index (colour-coordinate-corrected current efficiency) of over 490 cd A<sup>−1</sup> <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="41566_2025_1757_Article_IEq1.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="45" /> </InlineMediaObject> <EquationSource Format="TEX">\({{\rm{CIE}}}_{y}^{-1}\)</EquationSource> <EquationSource Format="MATHML"><math> <msubsup> <mrow> <mi mathvariant="normal">CIE</mi> </mrow> <mrow> <mi>y</mi> </mrow> <mrow> <mo>−</mo> <mn>1</mn> </mrow> </msubsup> </math></EquationSource> </InlineEquation> and unprecedented stability, with an extrapolated <i>T</i><sub>95</sub> lifetime (at an initial brightness of 1,000 cd m<sup>−2</sup>) 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.</p>

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Water-induced high-performance quantum-dot light-emitting diodes

  • 期刊论文

  • 发表日期：

    2025年9月10日

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  • Wangxiao Jin,
  • Siyu He,
  • Xiuyuan Lu,
  • Xitong Zhu,
  • Dijiong Liu,
  • Guolong Sun,
  • Yanlei Hao,
  • Zuyan Chen,
  • Chenyang Wang,
  • Jiejun Zeng,
  • Zhi Zheng,
  • Xiaolin Yan,
  • Yiran Yan,
  • Longjia Wu,
  • Xiongfeng Lin,
  • Wenjun Hou,
  • Weiran Cao,
  • Chuan Liu,
  • Xiaoci Liang,
  • Yuan Gao,
  • Yunzhou Deng,
  • Kaisheng Cao,
  • Yingguo Yang,
  • Feng Gao,
  • Yizheng Jin

摘要

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 \({{\rm{CIE}}}_{y}^{-1}\) CIE y − 1 and unprecedented stability, with an extrapolated T95 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.