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Issue 25, 2019
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Mixed-carbene cyclometalated iridium complexes with saturated blue luminescence

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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

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Publication details

The article was received on 21 Mar 2019, accepted on 26 May 2019 and first published on 27 May 2019


Article type: Edge Article
DOI: 10.1039/C9SC01386E
Chem. Sci., 2019,10, 6254-6260
  • Open access: Creative Commons BY license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    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

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