Issue 3, 2023

Effect of substitution position of dibenzofuran-terminated robust hole-transporters on physical properties and TADF OLED performances

Abstract

Although the wide-energy-gap hole-transport layer (HTL) is a key material to realizing high-efficiency and long-lifetime phosphorescent and thermally activated delayed fluorescent (TADF) organic light-emitting devices (OLEDs), a limited number of HTLs have been explored in previous studies. Accordingly, dibenzofuran-end-capped HTLs show promising performance in realizing a maximum external quantum efficiency (EQE) of 20% and a long lifetime of over 20 000 h at 1000 cd cm−2 in phosphorescent and TADF OLEDs. This study investigates the effects of the substitution positions of TnDBFBP (n = 1–4) derivatives with four DBF-end-capping groups to extensively study the molecular design of robust multifunctional HTLs. TnDBFBP derivatives exhibited a high glass transition temperature (Tg) of ∼149 °C, a triplet energy (ET) value of ∼2.9 eV, and anionic bond dissociation energy of ∼1.75 eV depending on the substitution positions. Consequently, T1DBFBP realized green TADF OLEDs with an EQE of over 20% and an operational lifetime of 50% of the initial luminance (LT50) of 30 000 h at 1000 cd m−2. These performances are among the best reported by previous studies.

Graphical abstract: Effect of substitution position of dibenzofuran-terminated robust hole-transporters on physical properties and TADF OLED performances

Supplementary files

Article information

Article type
Paper
Submitted
21 Oct 2022
Accepted
22 Nov 2022
First published
30 Nov 2022

Mol. Syst. Des. Eng., 2023,8, 388-393

Author version available

Effect of substitution position of dibenzofuran-terminated robust hole-transporters on physical properties and TADF OLED performances

S. Abe, H. Sasabe, T. Nakamura, M. Matsuya, Y. Saito, T. Hanayama, S. Araki, K. Kumada and J. Kido, Mol. Syst. Des. Eng., 2023, 8, 388 DOI: 10.1039/D2ME00225F

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