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Spirobifluorene-based hole-transporting materials for RGB OLEDs with high efficiency and low efficiency roll-off.

Qian Li1, Yusong Guo1, Jingbo Lan1

  • 1Key Laboratory of Green Chemistry and Technology of Ministry of Education College of Chemistry, Sichuan University 29 Wangjiang Road Chengdu 610064 People's Republic of China binzhengyang@scu.edu.cn woody@scu.edu.cn jingbolan@scu.edu.cn.

Chemical Science
|September 18, 2024
PubMed
Summary

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New spirobifluorene (SBF)-based hole-transporting materials (HTMs) offer high thermal and morphological stability for organic light-emitting diodes (OLEDs). The 3,6-substituted SBFs show promise as universal HTMs for efficient and stable RGB OLED devices.

Area of Science:

  • Materials Science
  • Organic Electronics
  • Photophysics

Background:

  • Hole-transporting materials (HTMs) are crucial for efficient organic light-emitting diodes (OLEDs).
  • Spirobifluorene (SBF) derivatives offer a rigid, 3D structure beneficial for morphological stability.
  • Achieving high triplet energies and excellent charge transport properties remains a challenge for universal HTMs.

Purpose of the Study:

  • To design and synthesize novel SBF-based HTMs with enhanced thermal and morphological stability.
  • To investigate the effect of substitution positions on the electronic properties and performance of SBF-based HTMs.
  • To evaluate the suitability of these new HTMs for red, green, and blue (RGB) phosphorescent OLEDs and narrowband blue OLEDs.

Main Methods:

  • Synthesis of three spirobifluorene (SBF)-based hole-transporting materials (HTMs) incorporating di-4-tolylamino groups at different positions.

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  • Characterization of thermal properties, including decomposition temperatures (Td) and glass transition temperatures (Tg).
  • Fabrication and performance evaluation of RGB phosphorescent OLEDs and narrowband blue OLEDs using the synthesized HTMs.

    • Main Results:

    • The synthesized HTMs exhibit excellent thermal stability (Td up to 506 °C) and morphological stability (Tg > 145 °C).
    • 3,6-substituted SBFs demonstrate higher triplet energies (ET) compared to 2,7-substituted analogs due to electronic decoupling.
    • The best performing HTM, 3,3',6,6'-tetra(N,N-ditolylamino)-9,9'-spirobifluorene (3,3',6,6'-TDTA-SBF), achieved high external quantum efficiencies (EQEmax) for RGB OLEDs (up to 26.4%) with low efficiency roll-off.
    • Narrowband blue OLEDs utilizing 3,3',6,6'-TDTA-SBF achieved an EQEmax of 29.8% with minimal roll-off.

    Conclusions:

    • The designed SBF-based HTMs possess superior thermal and morphological stability, making them suitable for demanding OLED applications.
    • The 3,6-substitution strategy effectively enhances triplet energies, enabling their use as universal HTMs for RGB phosphorescent OLEDs.
    • 3,3',6,6'-TDTA-SBF is a highly efficient HTM for both RGB and narrowband blue OLEDs, demonstrating significant potential for next-generation display technologies.