Issue 22, 2022

A multifunctional hole-transporter for high-performance TADF OLEDs and clarification of factors governing the transport property by multiscale simulation

Abstract

To date, a limited number of reports have been published on thermally activated delayed fluorescent (TADF) organic light-emitting devices (OLEDs) that simultaneously achieved high efficiencies and long operational lifetimes. The development of tailored-hole transporters is an effective solution because extensively used conventional hole-transport materials (HTMs), such as NPD or TAPC, are unsuitable for simultaneous realizations of high-efficiency and long-lifetime in TADF OLEDs. In this study, we developed a new four-dibenzofuran (DBF) end-capped hexaphenylbenzene (HPB)-based HTM, referred to as T4DBFHPB. Using this as the HTM, we simultaneously achieved high external quantum efficiency (ηext = 22.0%), long operational lifetime (LT50 = 28 000 h), and low-drive voltage (3.83 V) at 1000 cd m−2 in green TADF OLEDs. Our research reveals the importance of a multifunctional HTM with (i) high triplet energy (ET), (ii) high glass transition temperature (Tg), and (iii) high bond dissociation energy (BDE) of the C–N bonds in the anion state. Moreover, we conducted multiscale simulations to improve the hole-mobility (μh). Consequently, the simulation suggested that permanent-dipole-induced site energy and reorganization energy are critical factors for improving μh among HPB derivatives.

Graphical abstract: A multifunctional hole-transporter for high-performance TADF OLEDs and clarification of factors governing the transport property by multiscale simulation

Supplementary files

Article information

Article type
Paper
Submitted
21 Febr. 2022
Accepted
30 Apr. 2022
First published
23 Maijs 2022

J. Mater. Chem. C, 2022,10, 8694-8701

Author version available

A multifunctional hole-transporter for high-performance TADF OLEDs and clarification of factors governing the transport property by multiscale simulation

N. Nagamura, H. Sasabe, H. Sato, T. Kamata, N. Ito, S. Araki, S. Abe, Y. Sukegawa, D. Yokoyama, H. Kaji and J. Kido, J. Mater. Chem. C, 2022, 10, 8694 DOI: 10.1039/D2TC00716A

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