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Thermal assisted up-conversion electroluminescence in quantum dot light emitting diodes

Author

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  • Qiang Su

    (Southern University of Science and Technology)

  • Shuming Chen

    (Southern University of Science and Technology
    Key Laboratory of Energy Conversion and Storage Technologies (Southern University of Science and Technology), Ministry of Education)

Abstract

Up-conversion electroluminescence, in which the energy of a emitted photon is higher than that of the excitation electron, is observed in quantum-dot light-emitting diodes. Here, we study its mechanism by investigating the effect of thermal energy on the charge injection dynamic. Based on the results of temperature-dependent electroluminescence and theoretical analysis, we reveal that at sub-bandgap voltage, holes can be successfully injected into quantum-dots via thermal-assisted thermionic-emission mechanism, thereby enabling the sub-bandgap turn-on and up-conversion electroluminescence of the devices. Further theoretical deduction and experimental results confirm that thermal-assisted hole-injection is the universal mechanism responsible for the up-conversion electroluminescence. This work uncovers the charge injection process and unlocks the sub-bandgap turn-on mechanism, which paves the road for the development of up-conversion devices with power conversion efficiency over 100%.

Suggested Citation

  • Qiang Su & Shuming Chen, 2022. "Thermal assisted up-conversion electroluminescence in quantum dot light emitting diodes," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:13:y:2022:i:1:d:10.1038_s41467-022-28037-w
    DOI: 10.1038/s41467-022-28037-w
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    Cited by:

    1. 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.
    2. Yang Luo & Fan-Fang Kong & Xiao-Jun Tian & Yun-Jie Yu & Shi-Hao Jing & Chao Zhang & Gong Chen & Yang Zhang & Yao Zhang & Xiao-Guang Li & Zhen-Yu Zhang & Zhen-Chao Dong, 2024. "Anomalously bright single-molecule upconversion electroluminescence," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    3. 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.
    4. Yaxiao Lian & Dongchen Lan & Shiyu Xing & Bingbing Guo & Zhixiang Ren & Runchen Lai & Chen Zou & Baodan Zhao & Richard H. Friend & Dawei Di, 2022. "Ultralow-voltage operation of light-emitting diodes," Nature Communications, Nature, vol. 13(1), pages 1-10, December.

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