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Carbene metal amide photoemitters: tailoring conformationally flexible amides for full color range emissions including white-emitting OLED

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Abstract

Conformationally flexible “Carbene–Metal–Amide” (CMA) complexes of copper and gold have been developed based on a combination of sterically hindered cyclic (alkyl)(amino)carbene (CAAC) and 6- and 7-ring heterocyclic amide ligands. These complexes show photoemissions across the visible spectrum with PL quantum yields of up to 89% in solution and 83% in host-guest films. Single crystal X-ray diffraction and photoluminescence (PL) studies combined with DFT calculations indicate the important role of ring structure and conformational flexibility of the amide ligands. Time-resolved PL shows efficient delayed emission with sub-microsecond to microsecond excited state lifetimes at room temperature, with radiative rates exceeding 106 s−1. Yellow organic light-emitting diodes (OLEDs) based on a 7-ring gold amide were fabricated by thermal vapor deposition, while the sky-blue to warm-white mechanochromic behavior of the gold phenothiazine-5,5-dioxide complex enabled fabrication of the first CMA-based white light-emitting OLED.

Graphical abstract: Carbene metal amide photoemitters: tailoring conformationally flexible amides for full color range emissions including white-emitting OLED

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Publication details

The article was received on 12 Sep 2019, accepted on 12 Nov 2019 and first published on 13 Nov 2019


Article type: Edge Article
DOI: 10.1039/C9SC04589A
Chem. Sci., 2020, Advance Article
  • Open access: Creative Commons BY license
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    Carbene metal amide photoemitters: tailoring conformationally flexible amides for full color range emissions including white-emitting OLED

    A. S. Romanov, S. T. E. Jones, Q. Gu, P. J. Conaghan, B. H. Drummond, J. Feng, F. Chotard, L. Buizza, M. Foley, M. Linnolahti, D. Credgington and M. Bochmann, Chem. Sci., 2020, Advance Article , DOI: 10.1039/C9SC04589A

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