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Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode
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Highly Efficient All-Solution Processed Inverted Quantum Dots Based Light Emitting Diodes.

Yu Liu1, Congbiao Jiang1, Chen Song1

  • 1Institute of Polymer Optoelectronic Materials and Devices, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology , Guangzhou 510640, China.

ACS Nano
|January 25, 2018
PubMed
Summary
This summary is machine-generated.

Researchers improved quantum dot light-emitting diodes (QLEDs) by using orthogonal solvents and a double-layer hole transport layer (HTL). This enhanced efficiency and reduced roll-off in all-solution processed inverted QLEDs.

Keywords:
hole transport layerlight emitting diodesorthogonal solventquantum dotssolution process

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Area of Science:

  • Materials Science
  • Organic Electronics
  • Optoelectronics

Background:

  • Solution-processed inverted quantum dot light-emitting diodes (QLEDs) suffer from performance limitations due to solvent erosion of the quantum dot (QD) layer.
  • Achieving high external quantum efficiencies (EQE) and luminous efficiencies (LE) in QLEDs remains a challenge, particularly for all-solution processed devices.

Purpose of the Study:

  • To overcome solvent erosion issues in all-solution processed inverted QLEDs.
  • To enhance the performance of red, green, and blue QLEDs by optimizing the hole transport layer (HTL).
  • To reduce the turn-on voltage and efficiency roll-off in QLED devices.

Main Methods:

  • Utilized an orthogonal solvent, 1,4-dioxane, for the poly(9-vinlycarbazole) (PVK) HTL to prevent quantum dot (QD) layer erosion.
  • Introduced a double-layer HTL comprising PVK and poly[(9,9-dioctylfluorenyl-2,7-diyl)-co-(4,4'-(N-(p-butylphenyl))diphenylamine)] (TFB) to facilitate stepwise hole injection.
  • Fabricated and characterized red, green, and blue inverted QLEDs using the optimized HTL structures.

Main Results:

  • Employing 1,4-dioxane for the PVK HTL resulted in a 4-fold increase in EQE for red QLEDs and a 25-fold enhancement in LE for blue QLEDs.
  • The double-layer PVK/TFB HTL reduced the turn-on voltage for red, green, and blue QLEDs to 2.7 V, 2.7 V, and 4.1 V, respectively.
  • Achieved peak LEs of 22.1 cd/A (red), 21.4 cd/A (green), and 1.99 cd/A (blue), with maximum EQEs of 12.7% (red), 5.29% (green), and 5.99% (blue).

Conclusions:

  • The developed all-solution processed inverted QLEDs demonstrate state-of-the-art performance, with red and blue devices showing the best results among similar architectures.
  • The blue QLED performance surpasses all previously reported inverted QLEDs, including those fabricated via thermal evaporation.
  • The strategy of using orthogonal solvents and a double-layer HTL effectively mitigates solvent erosion and improves charge injection, paving the way for high-performance solution-processed QLEDs.