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Solution-processed green and blue quantum-dot light-emitting diodes with eliminated charge leakage

Deng, Yunzhou ; Peng, Feng ; Lu, Yao ; Zhu, Xitong ; Jin, Wangxiao ; Qiu, Jing ; Dong, Jiawei ; Hao, Yanlei ; Di, Dawei ; Gao, Yuan ; Sun, Tulai ; Zhang, Ming ; Liu, Feng ; Wang, Linjun ; Ying, Lei ; Huang, Fei ; Jin, Yizheng

Nature photonics, 2022-07, Vol.16 (7), p.505-511 [Periódico revisado por pares]

London: Nature Publishing Group

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  • Título:
    Solution-processed green and blue quantum-dot light-emitting diodes with eliminated charge leakage
  • Autor: Deng, Yunzhou ; Peng, Feng ; Lu, Yao ; Zhu, Xitong ; Jin, Wangxiao ; Qiu, Jing ; Dong, Jiawei ; Hao, Yanlei ; Di, Dawei ; Gao, Yuan ; Sun, Tulai ; Zhang, Ming ; Liu, Feng ; Wang, Linjun ; Ying, Lei ; Huang, Fei ; Jin, Yizheng
  • Assuntos: Commercialization ; Current carriers ; Electroluminescence ; Electron affinity ; Excitons ; Interfaces ; Leakage ; Light emitting diodes ; Optics ; Physics ; Polymers ; Quantum dots
  • É parte de: Nature photonics, 2022-07, Vol.16 (7), p.505-511
  • Notas: USDOE
    AC02-05CH11231
  • Descrição: Quantum-dot light-emitting diodes (QD-LEDs) promise a new generation of efficient, low-cost, large-area and flexible electroluminescent devices. However, the inferior performance of green and blue QD-LEDs compared with their red counterpart is hindering the commercialization of QD-LEDs in display and solid-state lighting applications. Here we demonstrate green and blue QD-LEDs with ~100% conversion of the injected charge carriers into emissive excitons. The key to success is the elimination of electron leakage at the organic/inorganic interface by using hole-transport polymers with simultaneous low electron affinity and reduced energetic disorder. Our devices exhibit high external quantum efficiencies over a wide range of luminance values (peak external quantum efficiencies of 28.7% for green and 21.9% for blue) and excellent stability (extrapolated T95 lifetime is 580,000 h for green and 4,400 h for blue QD-LEDs). We expect our work to provide a general strategy for eliminating charge leakage in solution-processed LEDs featuring organic/inorganic interfaces.A new strategy to reduce charge leakage in quantum-dot light-emitting diodes enables high external quantum efficiencies of 28.7% and 21.9% and excellent T95 lifetimes of 580,000 h and 4,400 h for green and blue devices, respectively.
  • Editor: London: Nature Publishing Group
  • Idioma: Inglês
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