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

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...

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Bibliographic Details
Published in:Nano research 2022-10, Vol.15 (10), p.9402-9409
Main Authors: Lin, Xing, Dai, Xingliang, Ye, Zikang, Shu, Yufei, Song, Zixuan, Peng, Xiaogang
Format: Article
Language:English
Subjects:
Atomic/Molecular Structure and Spectra
Biomedicine
Biotechnology
Brightness
Charge transport
Chemistry and Materials Science
Condensed Matter Physics
Efficiency
Electric potential
Electroluminescence
Energy conversion efficiency
Epitaxial growth
Light emitting diodes
Materials Science
Nanotechnology
Quantum dots
Research Article
Thermoelectricity
Voltage
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Summary: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/m 2 , 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 ( V p = hv/q = 1.96 V, q being the elemental charge). With typical V p = 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.
ISSN:1998-0124
1998-0000
DOI:10.1007/s12274-022-4942-x