Issue 32, 2023

Asymmetric anthracene hosts decorated with naphthobenzofurocarbazole for highly efficient deep-blue organic light-emitting diodes and low-efficiency roll-off

Abstract

Two fluorophores, 5-(4-(10-phenylanthracen-9-yl)phenyl)-5H-naphtho[2′,3′:4,5]furo[3,2-c]carbazole (ATPNF-1) and 5-(3-(10-phenylanthracen-9-yl)phenyl)-5H-naphtho[2′,3′:4,5]furo[3,2-c]carbazole (ATPNF-2), were synthesized by incorporating a naphthobenzofurocarbazole unit in different positions of the anthracene core. The fluorophores functioned as deep-blue fluorescent emitters and host materials for the t-DABNA dopant. ATPNF-1 predominantly exhibited a hybrid local and charge-transfer (HLCT) emission, with a minor contribution from the triplet–triplet fusion (TTF) channel. The non-doped organic light-emitting diode (OLED) device exhibited emission in the National Television System Committee standard blue color, with a narrow full width at half maximum of 54 nm and a maximum external quantum efficiency (EQE) of 7.0%, along with suppressed efficiency roll-off (an efficiency roll-off value of 4.8% at 1000 cd m−2). The t-DABNA-based device achieved a maximum EQE of 8.0% and a low-efficiency roll-off, demonstrating its highly efficient performance for deep-blue fluorescent OLEDs. These results can be attributed to the TTF-mediated high-lying reverse intersystem crossing process, highlighting the potential of such a blue-material design strategy for developing efficient OLED devices.

Graphical abstract: Asymmetric anthracene hosts decorated with naphthobenzofurocarbazole for highly efficient deep-blue organic light-emitting diodes and low-efficiency roll-off

Supplementary files

Article information

Article type
Paper
Submitted
15 May 2023
Accepted
05 Jul 2023
First published
06 Jul 2023

J. Mater. Chem. C, 2023,11, 10911-10922

Asymmetric anthracene hosts decorated with naphthobenzofurocarbazole for highly efficient deep-blue organic light-emitting diodes and low-efficiency roll-off

Y. Jeong, K. M. Hwang, J. H. Lee, M. J. Kwon, T. Kim and W. P. Hong, J. Mater. Chem. C, 2023, 11, 10911 DOI: 10.1039/D3TC01681A

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