Issue 7, 2020

Highly efficient blue thermally activated delayed fluorescence organic light emitting diodes based on tercarbazole donor and boron acceptor dyads

Abstract

Two new blue TADF emitters, namely, 9′-(2,12-di-tert-butyl-5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-9,9′′-diphenyl-9H,9′H,9′′H-3,3′:6′,3′′-tercarbazole (3CzTB) and 9′-(5,9-dioxa-13b-boranaphtho[3,2,1-de]anthracen-7-yl)-6,6′′-dimethyl-9,9′′-diphenyl-9H,9′H,9′′H-3,3′:6′,3′′-tercarbazole (M3CzB), for application in highly efficient organic light-emitting diodes are reported. These emitters consist of tercarbazole as donor and rigid oxygen bridged boron as acceptor units. Despite having the same donor and acceptor segments, an alkyl modification on the periphery of the donor and acceptor units altered their physicochemical properties and the electrochemical stability of the emitters. Blue TADF light-emitting devices fabricated with these emitters exhibited a maximum external quantum efficiency (EQE) and luminance of 30.7%, 18 160 cd m−2 and 29.1%, 11 690 cd m−2 for M3CzB and 3CzTB, respectively. The operational lifetime (LT50) of the stable blue TADF device fabricated with these emitters was 81 h and 60.5 h at 400 nits with the maximum EQE and CIE color coordinates of 14.4%, (0.13, 0.19) and 7.6%, (0.14, 0.10) for M3CzB and 3CzTB, respectively.

Graphical abstract: Highly efficient blue thermally activated delayed fluorescence organic light emitting diodes based on tercarbazole donor and boron acceptor dyads

Supplementary files

Article information

Article type
Paper
Submitted
31 okt 2019
Accepted
17 dek 2019
First published
18 dek 2019

J. Mater. Chem. C, 2020,8, 2272-2279

Highly efficient blue thermally activated delayed fluorescence organic light emitting diodes based on tercarbazole donor and boron acceptor dyads

D. Karthik, D. H. Ahn, J. H. Ryu, H. Lee, J. H. Maeng, J. Y. Lee and J. H. Kwon, J. Mater. Chem. C, 2020, 8, 2272 DOI: 10.1039/C9TC05950D

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