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Boosting Hole Mobility: Indenofluorene-Arylamine Copolymers and Their Impact on Solution-Processed OLED Performance.

Yerin Kim1, Youngjun Ham2, Thi Na Le1

  • 1Department of Information Display, College of Sciences, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemun-gu, Seoul 02447, Republic of Korea.

ACS Applied Materials & Interfaces
|June 10, 2024
PubMed
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Three new hole transport copolymers offer enhanced performance for solution-processed organic light-emitting diodes (s-OLEDs). These materials demonstrate high charge mobility and efficiency, comparable to vacuum-deposited OLEDs.

Area of Science:

  • Materials Science
  • Organic Electronics
  • Polymer Chemistry

Background:

  • Solution-processed organic light-emitting diodes (s-OLEDs) require efficient and stable hole transport layers (HTLs).
  • Developing thermally cross-linkable materials can improve solvent resistance and device stability in s-OLEDs.
  • Existing HTLs often face limitations in charge mobility and efficiency, hindering s-OLED performance.

Purpose of the Study:

  • To design and synthesize novel thermally cross-linkable hole transport copolymers for s-OLED applications.
  • To investigate the relationship between molecular design, charge transport properties, and device performance.
  • To evaluate the potential of these copolymers as high-performance HTLs in green phosphorescent s-OLEDs.

Main Methods:

  • Synthesis of three novel indenofluorene-based copolymers (PIF-TPD, PIF-F2PCz, PIF-TPAPCz) incorporating benzocyclobutene (BCB) and styrene-based cross-linking units.
Keywords:
benzocyclobutene and styrene-based cross-linking unitcross-linkable hole transport copolymershigh hole mobilityindenofluorene-based copolymerssolution-processed OLEDs

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  • Characterization of copolymer properties including thermal stability, solvent resistance, charge carrier mobility, and triplet energy levels.
  • Fabrication and testing of green phosphorescent s-OLEDs utilizing the synthesized copolymers as HTLs.

    • Main Results:

    • The synthesized copolymers exhibited high solvent resistance at a low cross-linking temperature (150 °C).
    • Outstanding hole charge carrier mobility of 1.61 × 10^-2 cm^2 V^-1 s^-1 was achieved, attributed to planar indenofluorene units and favorable orientation of hole transport moieties.
    • s-OLEDs incorporating these copolymers as HTLs demonstrated a maximum external quantum efficiency of 15.3% and a maximum current efficiency of 53.9 cd A^-1 with minimal efficiency roll-off.

    Conclusions:

    • The newly designed thermally cross-linkable hole transport copolymers show significant promise for advancing s-OLED technology.
    • These materials offer a viable alternative to vacuum-deposited layers, enabling high-performance and potentially lower-cost OLED fabrication.
    • The strategic molecular design allows for tunable properties, paving the way for future development of efficient organic electronic devices for displays and lighting.