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Highly efficient and stable InP/ZnSe/ZnS quantum dot light-emitting diodes

Author

Listed:
  • Yu-Ho Won

    (Samsung Electronics)

  • Oul Cho

    (Samsung Electronics)

  • Taehyung Kim

    (Samsung Electronics)

  • Dae-Young Chung

    (Samsung Electronics)

  • Taehee Kim

    (Yonsei University)

  • Heejae Chung

    (Samsung Electronics)

  • Hyosook Jang

    (Samsung Electronics)

  • Junho Lee

    (Samsung Electronics)

  • Dongho Kim

    (Yonsei University)

  • Eunjoo Jang

    (Samsung Electronics)

Abstract

Quantum dot (QD) light-emitting diodes (LEDs) are ideal for large-panel displays because of their excellent efficiency, colour purity, reliability and cost-effective fabrication1–4. Intensive efforts have produced red-, green- and blue-emitting QD-LEDs with efficiencies of 20.5 per cent4, 21.0 per cent5 and 19.8 per cent6, respectively, but it is still desirable to improve the operating stability of the devices and to replace their toxic cadmium composition with a more environmentally benign alternative. The performance of indium phosphide (InP)-based materials and devices has remained far behind those of their Cd-containing counterparts. Here we present a synthetic method of preparing a uniform InP core and a highly symmetrical core/shell QD with a quantum yield of approximately 100 per cent. In particular, we add hydrofluoric acid to etch out the oxidative InP core surface during the growth of the initial ZnSe shell and then we enable high-temperature ZnSe growth at 340 degrees Celsius. The engineered shell thickness suppresses energy transfer and Auger recombination in order to maintain high luminescence efficiency, and the initial surface ligand is replaced with a shorter one for better charge injection. The optimized InP/ZnSe/ZnS QD-LEDs showed a theoretical maximum external quantum efficiency of 21.4 per cent, a maximum brightness of 100,000 candelas per square metre and an extremely long lifetime of a million hours at 100 candelas per square metre, representing a performance comparable to that of state-of-the-art Cd-containing QD-LEDs. These as-prepared InP-based QD-LEDs could soon be usable in commercial displays.

Suggested Citation

  • Yu-Ho Won & Oul Cho & Taehyung Kim & Dae-Young Chung & Taehee Kim & Heejae Chung & Hyosook Jang & Junho Lee & Dongho Kim & Eunjoo Jang, 2019. "Highly efficient and stable InP/ZnSe/ZnS quantum dot light-emitting diodes," Nature, Nature, vol. 575(7784), pages 634-638, November.
  • Handle: RePEc:nat:nature:v:575:y:2019:i:7784:d:10.1038_s41586-019-1771-5
    DOI: 10.1038/s41586-019-1771-5
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    Cited by:

    1. Yajie Zhou & Yaxin Wang & Yonghui Song & Shanshan Zhao & Mingjiang Zhang & Guangen Li & Qi Guo & Zhi Tong & Zeyi Li & Shan Jin & Hong-Bin Yao & Manzhou Zhu & Taotao Zhuang, 2024. "Helical-caging enables single-emitted large asymmetric full-color circularly polarized luminescence," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    2. Hongjoo Shin & Doosun Hong & Hyunjin Cho & Hanhwi Jang & Geon Yeong Kim & Kyeong Min Song & Min-Jae Choi & Donghun Kim & Yeon Sik Jung, 2024. "Indirect-to-direct bandgap transition in GaP semiconductors through quantum shell formation on ZnS nanocrystals," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    3. Sudhir Kumar & Tommaso Marcato & Frank Krumeich & Yen-Ting Li & Yu-Cheng Chiu & Chih-Jen Shih, 2022. "Anisotropic nanocrystal superlattices overcoming intrinsic light outcoupling efficiency limit in perovskite quantum dot light-emitting diodes," Nature Communications, Nature, vol. 13(1), pages 1-10, December.
    4. Qiang Su & Zinan Chen & Shuming Chen, 2024. "Tracing the electron transport behavior in quantum-dot light-emitting diodes via single photon counting technique," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    5. Zezhou Li & Zhiheng Xie & Yao Zhang & Xilong Mu & Jisheng Xie & Hai-Jing Yin & Ya-Wen Zhang & Colin Ophus & Jihan Zhou, 2023. "Probing the atomically diffuse interfaces in Pd@Pt core-shell nanoparticles in three dimensions," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    6. Wenjing Zhang & Bo Li & Chun Chang & Fei Chen & Qin Zhang & Qingli Lin & Lei Wang & Jinhang Yan & Fangfang Wang & Yihua Chong & Zuliang Du & Fengjia Fan & Huaibin Shen, 2024. "Stable and efficient pure blue quantum-dot LEDs enabled by inserting an anti-oxidation layer," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    7. Junho Bae & Yuseop Shin & Hyungyu Yoo & Yongsu Choi & Jinho Lim & Dasom Jeon & Ilsoo Kim & Myungsoo Han & Seunghyun Lee, 2022. "Quantum dot-integrated GaN light-emitting diodes with resolution beyond the retinal limit," Nature Communications, Nature, vol. 13(1), pages 1-9, December.
    8. 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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