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Related Experiment Video

Updated: Dec 27, 2025

Step-by-Step Guide for Harnessing Organic Light Emitting Diodes by Solution Processed Device Fabrication of a TADF Emitter
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Solution-Processed Organic Light-Emitting Diodes Using a Photo-Crosslinkable Hole-Transporting Layer.

Jeong Yong Park1, Jae-Ho Jang1, Ji-Hoon Lee2

  • 1Department of Chemistry and Chemistry Institute for Functional Materials, Pusan National University, Busan 46241, Republic of Korea.

Journal of Nanoscience and Nanotechnology
|March 5, 2020
PubMed
Summary

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A novel photo-crosslinkable hole transporting layer (HTL) using poly(bis-4-butylphenyl-N,N-bisphenyl)benzidine (poly-TPD) and bis(4-azido-2,3,5,6-tetrafluorobenzoate) (FPA) enhances organic light-emitting diode (OLED) performance. This crosslinked HTL improves solvent resistance, enabling efficient solution processing for brighter, more stable OLED devices.

Area of Science:

  • Organic electronics
  • Materials science
  • Photochemistry

Background:

  • Solution-processed organic light-emitting diodes (OLEDs) offer cost-effective manufacturing.
  • Developing stable, solution-processable hole transporting layers (HTLs) is crucial for efficient OLEDs.
  • Achieving solvent resistance in HTLs is key for multi-layer solution deposition.

Purpose of the Study:

  • To develop a photo-crosslinkable HTL for solution-processed OLEDs.
  • To investigate the effect of photocrosslinking on HTL properties and device performance.
  • To enable subsequent solution deposition of emissive layers onto the HTL.

Main Methods:

  • A blend of poly(bis-4-butylphenyl-N,N-bisphenyl)benzidine (poly-TPD) and bis(4-azido-2,3,5,6-tetrafluorobenzoate) (FPA) was used to form the HTL.

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  • Photo-crosslinking was induced to render the HTL insoluble in organic solvents.
  • Red and green OLEDs were fabricated using solution processing with the crosslinked HTL.

    • Main Results:

    • The photo-crosslinked poly-TPD:FPA (1 wt%) HTL exhibited enhanced solvent resistance compared to neat poly-TPD.
    • Solution-processed OLEDs with the crosslinked HTL showed improved device performance.
    • The crosslinking enabled the successful solution deposition of subsequent layers.

    Conclusions:

    • Photo-crosslinkable HTLs are effective for solution-processed OLEDs.
    • The poly-TPD:FPA blend provides a robust and efficient HTL solution.
    • This approach facilitates the development of high-performance, cost-effective OLEDs.