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Inverted Solution-Processed Quantum Dot Light-Emitting Devices with Wide Band Gap Quantum Dot Interlayers.

Mohsen Azadinia1, Tyler Davidson-Hall1, Dong Seob Chung1

  • 1Department of Electrical and Computer Engineering and Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 3G1, Canada.

ACS Applied Materials & Interfaces
|May 4, 2023
PubMed
Summary

Adding a quantum dot interlayer to inverted quantum dot light-emitting devices (IQLEDs) with polymeric hole transport layers (HTLs) significantly boosts efficiency and device lifetime by addressing electron leakage and exciton quenching.

Keywords:
exciton quenchinginterlayerinverted quantum dots light-emitting devicepolymeric hole transport layersolution-processed

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Area of Science:

  • Materials Science
  • Optoelectronics
  • Nanotechnology

Background:

  • Polymeric hole transport layers (HTLs) are beneficial for device fabrication in inverted quantum dot light-emitting devices (IQLEDs).
  • However, their use often results in poor device performance due to issues at the HTL interface.
  • Previous assumptions attributed poor performance to solvent damage, which this study refutes.

Purpose of the Study:

  • To identify the primary causes of poor performance in IQLEDs utilizing polymeric HTLs.
  • To develop a strategy to mitigate interface-related issues and enhance IQLED performance.
  • To gain deeper insights into charge injection mechanisms and their dependence on quantum dot (QD) properties.

Main Methods:

  • Investigated the role of a wider band gap QD interlayer (IL) between the HTL and emission material layer (EML).
  • Fabricated and characterized IQLEDs with and without the IL, measuring efficiency and operational lifetime.
  • Conducted single-carrier device measurements and ultraviolet photoelectron spectroscopy (UPS) to analyze charge injection and energy levels.

Main Results:

  • The IL effectively facilitates hole injection, suppresses electron leakage, and reduces exciton quenching at the HTL interface.
  • IQLEDs with the IL showed a 2.85× increase in efficiency (3% to 8.56%) and a 9.4× improvement in lifetime (1266 to 11,950 h).
  • Charge injection analysis revealed that electron injection is easier with smaller band gap QDs, while hole injection becomes more difficult, correlating with QD band alignment.

Conclusions:

  • The primary cause of poor performance in polymeric HTL-based IQLEDs is interface-related issues, not solvent damage.
  • A wider band gap QD interlayer is a simple yet effective method to significantly enhance IQLED performance.
  • The study provides crucial insights into QD band gap-dependent charge injection and HTL interface properties in different device architectures.