Issue 25, 2019

Mixed-carbene cyclometalated iridium complexes with saturated blue luminescence

Abstract

Cyclometalated iridium complexes have emerged as top-performing emitters in organic light-emitting diodes (OLEDs) and other optoelectronic devices. A persistent challenge has been the development of cyclometalated iridium complexes with deep blue luminescence that have the requisite color purity, efficiency, and stability to function in color displays. In this work we report a new class of cyclometalated iridium complexes with saturated blue luminescence. These complexes have the general structure Ir(C^C:NHC)2(C^C:ADC), where C^C:NHC is an N-heterocyclic carbene (NHC) derived cyclometalating ligand and C^C:ADC is a different type of cyclometalating ligand featuring an acyclic diaminocarbene (ADC). The complexes are prepared by a cascade reaction that involves nucleophilic addition of propylamine to an isocyanide precursor followed by base-assisted cyclometalation of the ADC intermediate. All three emit deep blue light with good quantum efficiencies (ΦPL = 0.13–0.48) and color profiles very close to the ideal primary blue standards for color displays.

Graphical abstract: Mixed-carbene cyclometalated iridium complexes with saturated blue luminescence

Supplementary files

Article information

Article type
Edge Article
Submitted
21 mrt 2019
Accepted
26 mei 2019
First published
27 mei 2019
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., 2019,10, 6254-6260

Mixed-carbene cyclometalated iridium complexes with saturated blue luminescence

H. Na, Louise M. Cañada, Z. Wen, J. I-Chia Wu and T. S. Teets, Chem. Sci., 2019, 10, 6254 DOI: 10.1039/C9SC01386E

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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