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

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 () and Jang Hyuk Kwon ()
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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

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-47307-3

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