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Development of Efficient OLEDs from Solution Deposition
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Efficient OLEDs Based on Slot-Die-Coated Multicomponent Emissive Layer.

Ewelina Witkowska1,2, Ireneusz Glowacki1, Tung-Huei Ke2

  • 1Department of Molecular Physics, Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland.

Polymers
|August 26, 2022
PubMed
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Slot-die coating of organic light-emitting diodes (OLEDs) with iridium complexes shows promise. Rapid annealing minimizes performance loss from oxygen, significantly boosting OLED efficiency for industrial applications.

Area of Science:

  • Materials Science
  • Organic Electronics
  • Device Engineering

Background:

  • Organic light-emitting diodes (OLEDs) are crucial for modern displays and lighting.
  • Efficient deposition techniques for multicomponent emissive layers (EMLs) are key for industrial OLED manufacturing.
  • Slot-die coating offers a scalable alternative to spin coating for EML fabrication.

Purpose of the Study:

  • To optimize multicomponent emissive layer (EML) deposition by slot-die coating for organic light-emitting diodes (OLEDs).
  • To compare the performance of OLEDs with slot-die-coated EMLs prepared in air versus spin-coated EMLs prepared in nitrogen.
  • To investigate the effect of annealing on OLEDs fabricated with slot-die coating.

Main Methods:

  • Deposition of iridium-doped emissive layers using slot-die coating and spin coating.
Keywords:
OLEDsTADF assistant dopantprinted electronicsprinted organic deviceslot-die coating

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  • Utilizing two host materials: poly(N-vinylcarbazole) (PVK) with oxadiazole derivative (PBD), or PVK with a thermally activated delayed fluorescence (TADF) dopant (SpiroAC-TRZ).
  • Fabrication of OLED devices and characterization of their performance (current efficiency).

    • Main Results:

    • OLEDs with PVK:PBD host and iridium dopant showed comparable performance (~13 cd A⁻¹) regardless of deposition method.
    • OLEDs with PVK and SpiroAC-TRZ host achieved the highest current efficiency (21 cd A⁻¹) with spin coating.
    • Slot-die coated OLEDs in air showed lower efficiency, but rapid annealing in nitrogen more than doubled efficiency (from 7 cd A⁻¹ to >15 cd A⁻¹).

    Conclusions:

    • Slot-die coating is a viable method for OLED EML deposition, comparable to spin coating for certain host systems.
    • Oxygen negatively impacts energy transfer in TADF-assisted OLEDs, but rapid post-deposition annealing mitigates this.
    • The developed annealing strategy enhances efficiency and is transferable to other printing techniques, improving yield.