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On the degradation mechanisms of quantum-dot light-emitting diodes

Author

Listed:
  • Song Chen

    (Soochow University)

  • Weiran Cao

    (TCL Corporate Research)

  • Taili Liu

    (City University of Hong Kong)

  • Sai-Wing Tsang

    (City University of Hong Kong)

  • Yixing Yang

    (TCL Corporate Research)

  • Xiaolin Yan

    (TCL Corporate Research)

  • Lei Qian

    (TCL Corporate Research)

Abstract

The operating lifetime of blue quantum-dot light-emitting diodes (QLED) is currently a short slab for this emerging display technology. To pinpoint the origin of device degradation, here we apply multiple techniques to monitor the electric-field distribution and space-charge accumulation across the multilayered structure before and after lifetime tests. Evident by charge-modulated electro-absorption and capacitance-voltage characteristics, the excited electrons in blue quantum dots (QD) are prone to cross the type II junction between the QD emission layer and the electron-transporting layer (ETL) due to the offset of conduction band minimum, leading to space-charge accumulation and operating-voltage rise in the ETL. Therefore, unlike those very stable red devices, of which the lifetime is primarily limited by the slow degradation of hole-transporting layer, the poor lifetime of blue QLED originates from the fast degradation at the QD-ETL junction. Materials engineering for efficient electron injection is prerequisite for the boost of operating lifetime.

Suggested Citation

  • Song Chen & Weiran Cao & Taili Liu & Sai-Wing Tsang & Yixing Yang & Xiaolin Yan & Lei Qian, 2019. "On the degradation mechanisms of quantum-dot light-emitting diodes," Nature Communications, Nature, vol. 10(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-08749-2
    DOI: 10.1038/s41467-019-08749-2
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    Cited by:

    1. Siyu He & Xiaoqi Tang & Yunzhou Deng & Ni Yin & Wangxiao Jin & Xiuyuan Lu & Desui Chen & Chenyang Wang & Tulai Sun & Qi Chen & Yizheng Jin, 2023. "Anomalous efficiency elevation of quantum-dot light-emitting diodes induced by operational degradation," Nature Communications, Nature, vol. 14(1), pages 1-11, December.
    2. Pode, Ramchandra, 2020. "Organic light emitting diode devices: An energy efficient solid state lighting for applications," Renewable and Sustainable Energy Reviews, Elsevier, vol. 133(C).
    3. Xingtong Chen & Xiongfeng Lin & Likuan Zhou & Xiaojuan Sun & Rui Li & Mengyu Chen & Yixing Yang & Wenjun Hou & Longjia Wu & Weiran Cao & Xin Zhang & Xiaolin Yan & Song Chen, 2023. "Blue light-emitting diodes based on colloidal quantum dots with reduced surface-bulk coupling," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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