Issue 5, 2019

A series of red iridium(iii) complexes using flexible dithiocarbamate derivatives as ancillary ligands for highly efficient phosphorescent OLEDs

Abstract

Five red cyclometalated iridium(III) complexes containing the unique four-membered ring Ir–S–C–S backbone with different dithiocarbamate derivatives as ancillary ligands and 1-(4-(trifluoromethyl)phenyl)isoquinoline (4tfmpiq) as the main ligand were synthesized at room temperature within ten minutes. The emission color (λpeak = 607–619 nm) and photoluminescence quantum efficiency (PLQY) (ΦP = 36.6–63.0%) can be effectively tuned by introducing different electron – donating substituents such as diisopropylamine (dipdtc), diphenylamine (dpdtc), bis(4-(tert-butyl)phenyl)amine (tBudpdtc), carbazole (Czdtc) and 3,6-di-tert-butyl-9H-carbazole (tBuCzdtc) into the dithiocarbamate ancillary ligands. Employing (4tfmpiq)2Ir(dipdtc) as the emitter, the organic light emitting diodes (OLEDs) with double emitting layers exhibit good performances with a maximum current efficiency (ηc,max) of 18.67 cd A−1, an EQEmax of 20.69% and low efficiency roll-off with an EQE of 18.11% at the practical luminance of 1000 cd m−2. The Commision Internationale de L’Eclairage coordinates of (0.660, 0.337) are quite close to the National Television System Comittee (NTSC) standard red emission. These results demonstrate that by introducing different electron – donating substituents into the dithiocarbamate ligands, the diversity of the S–C–S ligands is greatly enriched for red Ir(III) complexes and the corresponding OLEDs.

Graphical abstract: A series of red iridium(iii) complexes using flexible dithiocarbamate derivatives as ancillary ligands for highly efficient phosphorescent OLEDs

Associated articles

Supplementary files

Article information

Article type
Research Article
Submitted
10 فرؤری 2019
Accepted
18 مارٕچ 2019
First published
19 مارٕچ 2019

Mater. Chem. Front., 2019,3, 860-866

A series of red iridium(III) complexes using flexible dithiocarbamate derivatives as ancillary ligands for highly efficient phosphorescent OLEDs

G. Lu, R. Wu, L. Liu, L. Zhou, Y. Zheng, W. Zhang, J. Zuo and H. Zhang, Mater. Chem. Front., 2019, 3, 860 DOI: 10.1039/C9QM00088G

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