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Research Article

Highly-efficient thermoelectric-driven light-emitting diodes based on colloidal quantum dots

Xing Lin1,2,§Xingliang Dai1,3,§Zikang Ye1,4,§Yufei Shu1Zixuan Song2Xiaogang Peng1( )
Key Laboratory of Excited-State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou 310027, China
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou 310027, China
State Key Laboratory of Silicon Materials, Department of Material Science and Engineering, Zhejiang University, Hangzhou 310027, China
College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China

§ Xing Lin, Xingliang Dai, and Zikang Ye contributed equally to this work.

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Graphical Abstract

Efficient thermal-electrical driven light-emitting diodes can be constructed based on solution-processed colloidal quantum dots (QLEDs). The device can achieve its peak internal power conversion efficiency (IPE ~ 90%) and remain high level within the current density range of 0.5–100 mA/cm2 which matches the demand of display and lighting applications. Micro-LEDs based on epitaxially grown quantum well (QW-LEDs) exhibit very limited power conversion efficiency in the same current density range due to leakage current and/or Shockley–Read–Hall (SRH) nonradiative recombination.

Abstract

Driven by sub-bandgap electric work and Peltier heat, thermoelectric-driven light-emitting diodes (TED-LEDs) not only offer much enhanced power-conversion-efficiency but also eliminate the waste heat generated during the operation of LEDs. However, cost-effective and high-efficiency TED-LEDs are not readily accessible for the epitaxially grown III-V LEDs due to the high chip cost and efficiency droop at low-medium brightness (current densities). Here we show that electroluminescence of colloidal quantum dots (QDs) LEDs (QLEDs) circumvents the deficiencies faced by conventional LEDs. The optimal red-emitting device fabricated by cost-effective solution processing technics exhibits external- and internal-power-conversion-efficiency of 21.5% and 93.5% at 100 cd/m2, suited for high-efficiency solid-state lighting and high-resolution display. At this brightness, the electric driving voltage (V) of 1.89 V is lower than the photon voltage (Vp = hv/q = 1.96 V, q being the elemental charge). With typical Vp = 1.96 V, electroluminescence can be detected with the driving voltage as low as 1.0–1.2 V. Luminance of the thermoelectric-driven QLEDs (TED-QLEDs) remains ideally diffusion-dominated with the driving voltage lower than ~ 1.5 V, and further improvement on charge transport is expected to extend the linear ideality to all practical driving voltages.

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Nano Research
Pages 9402-9409
Cite this article:
Lin X, Dai X, Ye Z, et al. Highly-efficient thermoelectric-driven light-emitting diodes based on colloidal quantum dots. Nano Research, 2022, 15(10): 9402-9409. https://doi.org/10.1007/s12274-022-4942-x
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Received: 17 August 2022
Accepted: 22 August 2022
Published: 26 August 2022
© Tsinghua University Press 2022
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