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Modified t-butyl in tetradentate platinum (II) complexes enables exceptional lifetime for blue-phosphorescent organic light-emitting diodes

Author

Listed:
  • Young Hun Jung

    (Kyung Hee University)

  • Gyeong Seok Lee

    (Gyeongsang National University)

  • Subramanian Muruganantham

    (Kyung Hee University)

  • Hye Rin Kim

    (Kyung Hee University)

  • Jun Hyeog Oh

    (Kyung Hee University)

  • Jung Ho Ham

    (Kyung Hee University)

  • Sagar B. Yadav

    (Kyung Hee University)

  • Ji Hyun Lee

    (Gyeongsang National University)

  • Mi Young Chae

    (Kyung Hee University)

  • Yun-Hi Kim

    (Gyeongsang National University)

  • Jang Hyuk Kwon

    (Kyung Hee University)

Abstract

In blue phosphorescent dopants, the tetradentate platinum(II) complex is a promising material showing high efficiency and stability in devices. However, metal-metal-to-ligand charge transfer (MMLCT) formation leads to low photo-luminescence quantum yields (PLQYs), wide spectra, and intermolecular interaction. To suppress MMLCT, PtON-tb-TTB and PtON-tb-DTB are designed using theoretical simulation by modifying t-butyl in PtON-TBBI. Both materials effectively suppress MMLCT and exhibit high PLQYs of 99% and 78% in 5 wt% doped film, respectively. The PtON-tb-TTB and PtON-tb-DTB devices have maximum external quantum efficiencies of 26.3% and 20.9%, respectively. Additionally, the PtON-tb-DTB device has an extended lifetime of 169.3 h with an initial luminescence of 1200 nit, which is 8.5 times greater than the PtON-TBBI device. Extended lifetime because of suppressed MMLCT and smaller displacement between the lowest triplet and triplet metal-centered states compared to other dopants. The study provides an effective approach to designing platinum(II) complexes for long device lifetimes.

Suggested Citation

  • Young Hun Jung & Gyeong Seok Lee & Subramanian Muruganantham & Hye Rin Kim & Jun Hyeog Oh & Jung Ho Ham & Sagar B. Yadav & Ji Hyun Lee & Mi Young Chae & Yun-Hi Kim & Jang Hyuk Kwon, 2024. "Modified t-butyl in tetradentate platinum (II) complexes enables exceptional lifetime for blue-phosphorescent organic light-emitting diodes," Nature Communications, Nature, vol. 15(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-47307-3
    DOI: 10.1038/s41467-024-47307-3
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    References listed on IDEAS

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    1. Jaesang Lee & Changyeong Jeong & Thilini Batagoda & Caleb Coburn & Mark E. Thompson & Stephen R. Forrest, 2017. "Hot excited state management for long-lived blue phosphorescent organic light-emitting diodes," Nature Communications, Nature, vol. 8(1), pages 1-9, August.
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