Issue 12, 2022

Efficient red organic LEDs via the combination of an exciplex host and micro-cavity

Abstract

Exploring exciplexes as the host in organic light-emitting diodes (OLEDs) has attracted extensive attention because of the low driving voltage and high efficiency. However, conventional exciplex-host-based bottom-emission still shows undesirable efficiencies, especially in the red emission channels, due to energy gap law. We here propose exciplex-host-based top-emitting devices to achieve breakthrough efficiency in red light-emitting devices. We optimize the exciplex hosts to maximize energy transfer to the emitting dyes and the cavity length and reflective electrodes to achieve efficient red organic LEDs. We report a current efficiency of 99.7 cd A−1 for a red OLED with an electroluminescence (EL) peak at 604 nm (full width at half maximum of 32 nm); these efficiencies are the best in red OLEDs, especially with a narrow EL spectrum. This work offers a new strategy to achieve high efficiency and high color-purity LEDs simultaneously.

Graphical abstract: Efficient red organic LEDs via the combination of an exciplex host and micro-cavity

Supplementary files

Article information

Article type
Research Article
Submitted
07 ⵎⴰⵕ 2022
Accepted
24 ⵉⴱⵔ 2022
First published
25 ⵉⴱⵔ 2022

Mater. Chem. Front., 2022,6, 1623-1629

Efficient red organic LEDs via the combination of an exciplex host and micro-cavity

J. Li, Y. Wang, J. Zhou, W. He, X. Dong, C. Zhang, X. Shi, L. Lia and M. Fung, Mater. Chem. Front., 2022, 6, 1623 DOI: 10.1039/D2QM00203E

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