Issue 7, 2022

New aggregation-induced delayed fluorescent materials for efficient OLEDs with high stabilities of emission color and efficiency

Abstract

Thermally activated delayed fluorescence (TADF) can harvest both singlet and triplet excitons to achieve high electroluminescence (EL) efficiency for organic light-emitting diodes (OLEDs). However, many TADF emitters generally suffer from severe emission quenching and exciton annihilation at high voltages or luminance. To address this issue, in this work, two new luminogens, CDBP-BP-PXZ and CDBP-BP-DMAC, consisting of an electron-withdrawing benzoyl group and electron-donating 9,9′-(2,2′-dimethyl-[1,1′-biphenyl]-4,4′-diyl)bis(9H-carbazole) and phenoxazine/9,9-dimethyl-9,10-dihydroacridine are synthesized and characterized. They exhibit high thermal and electrochemical stabilities and show interesting aggregation-induced delayed fluorescence properties. They exhibit good EL performances in nondoped and doped OLEDs with high electroluminescence (EL) efficiencies, very small efficiency roll-offs and high emission color stability. The excellent EL performance of both luminogens disclose their good application potential in practical display and lighting devices.

Graphical abstract: New aggregation-induced delayed fluorescent materials for efficient OLEDs with high stabilities of emission color and efficiency

Supplementary files

Article information

Article type
Research Article
Submitted
16 Kax 2021
Accepted
10 Nah 2022
First published
11 Nah 2022

Mater. Chem. Front., 2022,6, 924-932

New aggregation-induced delayed fluorescent materials for efficient OLEDs with high stabilities of emission color and efficiency

H. Chen, H. Liu, Y. Xiong, J. He, Z. Zhao and B. Z. Tang, Mater. Chem. Front., 2022, 6, 924 DOI: 10.1039/D1QM01625C

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