Issue 27, 2024

Oxygen-bridged triarylboron substituted anthracene emitters with high-lying triplet–singlet intersystem crossing for efficient deep-blue OLEDs

Abstract

Hot exciton emitters have been confirmed as promising materials for the construction of blue organic light-emitting diodes (OLEDs). Here, two new deep-blue hot exciton emitters, D–A type BOOAn and A–D–A type 2BOOAn, are designed and synthesized by using the rigid oxygen-bridged triarylboron structure as the acceptor (A) and anthracene as the donor (D). The 2BOOAn-based doped devices achieved efficient deep-blue emission with a maximum external quantum efficiency (EQEmax) of 10.1%, an electroluminescence (EL) emission peak at 440 nm, CIE coordinates of (0.151, 0.073), and a calculated exciton utilisation efficiency (EUE) of 46–68%. Finally, the presence of reverse intersystem crossing from high-lying triplet T2 to S1 (hRISC) was experimentally verified. In addition, the transient EL (Tr-EL) analysis and the magneto-electroluminescence (MEL) measurement showed that the TTA mechanism hardly contributes to the EL process, so the high EUE of the device can be mainly attributed to the hot exciton mechanism.

Graphical abstract: Oxygen-bridged triarylboron substituted anthracene emitters with high-lying triplet–singlet intersystem crossing for efficient deep-blue OLEDs

Supplementary files

Article information

Article type
Communication
Submitted
20 Apr 2024
Accepted
03 Jun 2024
First published
17 Jun 2024

J. Mater. Chem. C, 2024,12, 9929-9938

Oxygen-bridged triarylboron substituted anthracene emitters with high-lying triplet–singlet intersystem crossing for efficient deep-blue OLEDs

Z. Lu, D. Hu, S. Chen, R. Wang, L. Xing, Y. Zhu, J. Lin, Y. Huo and S. Ji, J. Mater. Chem. C, 2024, 12, 9929 DOI: 10.1039/D4TC01621A

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