Issue 32, 2024

Exciton dynamics of the efficiency roll-off of exciplex-based OLEDs and low efficiency roll-off phosphorescence OLEDs based on an exciplex as the host

Abstract

Exciplexes with thermally activated delayed fluorescence (TADF) characteristics have been well applied to fabricate high performance organic light-emitting diodes (OLEDs). In this work, we propose the exciton dynamics of the efficiency roll-off properties of OLEDs based on four different exciplexes as emitters, and demonstrate the effect of the relationship between the photoluminescence (PL) quantum efficiency and exciton decay rates on the electroluminescence (EL) performance of the exciplex-based OLEDs. Through simulation, the diffusion lengths of singlet and triplet excitons were calculated based on the annihilation rate constants. Moreover, high efficiency and low efficiency roll-off blue, green, yellow and red phosphorescence OLEDs (PHOLEDs) were fabricated by employing the optimized exciplexes as the host of four different color phosphors, fully elucidating the importance of matching the energy levels of exciplexes with the phosphor guests. This work is very helpful to better understand the exciton dynamics of exciplexes and for the fabrication of high efficiency and low efficiency roll-off PHOLEDs based on exciplexes as a host.

Graphical abstract: Exciton dynamics of the efficiency roll-off of exciplex-based OLEDs and low efficiency roll-off phosphorescence OLEDs based on an exciplex as the host

Article information

Article type
Paper
Submitted
17 май 2024
Accepted
05 юли 2024
First published
07 юли 2024

J. Mater. Chem. C, 2024,12, 12317-12324

Exciton dynamics of the efficiency roll-off of exciplex-based OLEDs and low efficiency roll-off phosphorescence OLEDs based on an exciplex as the host

W. Liu, J. Pan, Q. Sun, Y. Dai, D. Yang, X. Qiao and D. Ma, J. Mater. Chem. C, 2024, 12, 12317 DOI: 10.1039/D4TC02043J

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements