Issue 21, 2020

Simultaneous realization of high-efficiency, low-drive voltage, and long lifetime TADF OLEDs by multifunctional hole-transporters

Abstract

Although organic light emitting devices (OLEDs) based on thermally activated delayed fluorescence (TADF) have already achieved impressively high external quantum efficiency (ηext) of over 35%, their operation lifetime still needs to be improved for practical applications. In this study, we developed a molecular design for fabricating high triplet energy (ET = 2.7 eV) multifunctional hole-transport layers (HTLs) based on a hexaphenylbenzene skeleton to realize record-breaking efficient and stable TADF OLEDs. By using a dibenzofuran-end-capped HTL named 4DBFHPB, we could successfully develop a highly efficient, low-drive voltage, and stable green TADF OLED exhibiting an ηext of 19.2% and operation lifetime (LT50) of ∼24 000 h at an initial luminance of 1000 cd m−2. The drive voltage at 1000 cd m−2 was recorded to be 4.07 V. We also developed a sky-blue TADF OLED exhibiting an ηext of 21.5% and LT50 of ∼1700 h at an initial luminance of 500 cd m−2. The developed designs demonstrate record-breaking performances among the existing TADF OLEDs.

Graphical abstract: Simultaneous realization of high-efficiency, low-drive voltage, and long lifetime TADF OLEDs by multifunctional hole-transporters

Supplementary files

Article information

Article type
Paper
Submitted
18 jan 2020
Accepted
14 apr 2020
First published
01 máj 2020

J. Mater. Chem. C, 2020,8, 7200-7210

Author version available

Simultaneous realization of high-efficiency, low-drive voltage, and long lifetime TADF OLEDs by multifunctional hole-transporters

T. Kamata, H. Sasabe, N. Ito, Y. Sukegawa, A. Arai, T. Chiba, D. Yokoyama and J. Kido, J. Mater. Chem. C, 2020, 8, 7200 DOI: 10.1039/D0TC00330A

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