Issue 17, 2018

De novo design of D–σ–A molecules as universal hosts for monochrome and white phosphorescent organic light-emitting diodes

Abstract

Two novel D–σ–A host materials 11,11-bis(9-phenyl-9H-carbazol-3-yl)-11H-benzo[4,5]imidazo[1,2-a]indole (BII–BCz) and 4,4′-(11H-benzo[4,5]imidazo[1,2-a]indole-11,11-diyl)bis(N,N-diphenylaniline) (BII–TPA) are synthesized by using the sp3 carbon attached to a newly designed 11H-benzo[4,5]imidazo[1,2-a]indole building block to link two electron-donating groups. The resulting materials feature high triplet energy levels, good thermal properties and suitable photophysical properties as universal hosts for full-color phosphorescent organic light-emitting diodes (OLEDs). Both BII–BCz and BII–TPA reveal excellent performances in blue, green, yellow, orange and red phosphorescent OLEDs with the same device structure. The employment of the new D–σ–A materials as single hosts in white OLEDs with a simple device structure allows us to achieve state-of-the-art performances. A single-emissive-layer white device based on BII–BCz demonstrates the highest performance with an external quantum efficiency up to 28.2% at 1000 cd m−2. Furthermore, this device displays extremely stable emission spectra, with a ΔCIE of only (0.009, 0.005) from 1000 to 10 000 cd m−2.

Graphical abstract: De novo design of D–σ–A molecules as universal hosts for monochrome and white phosphorescent organic light-emitting diodes

Supplementary files

Article information

Article type
Edge Article
Submitted
18 Jan 2018
Accepted
08 Mar 2018
First published
08 Mar 2018
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY license

Chem. Sci., 2018,9, 4062-4070

De novo design of D–σ–A molecules as universal hosts for monochrome and white phosphorescent organic light-emitting diodes

W. Chen, Y. Yuan, Z. Zhu, Z. Jiang, S. Su, L. Liao and C. Lee, Chem. Sci., 2018, 9, 4062 DOI: 10.1039/C8SC00282G

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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