Issue 36, 2024

Unraveling non-radiative decay channels of exciplexes to construct efficient red emitters for organic light-emitting diodes

Abstract

Exciplex emitters naturally have thermally activated delayed fluorescence characteristics due to their spatially separated molecular orbitals. However, the intermolecular charge transfer potentially induces diverse non-radiative decay channels, severely hindering the construction of efficient red exciplexes. Thus, a thorough comprehension of this energy loss is of paramount importance. Herein, different factors, including molecular rigidity, donor–acceptor interactions and donor–donor/acceptor–acceptor interactions, that impact the non-radiative decay were systematically investigated using contrasting exciplex emitters. The exciplex with rigid components and intermolecular hydrogen bonds showed a photoluminescence quantum yield of 84.1% and a singlet non-radiative decay rate of 1.98 × 106 s−1 at an optimized mixing ratio, respectively, achieving a 3.3-fold increase and a 70% decrease compared to the comparison group. In the electroluminescent device, a maximum external quantum efficiency of 23.8% was achieved with an emission peak of 608 nm, which represents the state-of-the-art organic light-emitting diodes using exciplex emitters. Accordingly, a new strategy is finally proposed, exploiting system rigidification to construct efficient red exciplex emitters that suppress non-radiative decay.

Graphical abstract: Unraveling non-radiative decay channels of exciplexes to construct efficient red emitters for organic light-emitting diodes

Supplementary files

Article information

Article type
Edge Article
Submitted
04 Jun 2024
Accepted
29 Jul 2024
First published
02 Aug 2024
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2024,15, 14651-14659

Unraveling non-radiative decay channels of exciplexes to construct efficient red emitters for organic light-emitting diodes

H. Zhang, M. Zhang, H. Zhuo, H. Yang, B. Han, Y. Zheng, H. Wang, H. Lin, S. Tao, C. Zheng and X. Zhang, Chem. Sci., 2024, 15, 14651 DOI: 10.1039/D4SC03667K

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