Carbene metal amide photoemitters: tailoring conformationally flexible amides for full color range emissions including white-emitting OLED.
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Romanov, A. S., Jones, S. T. E., Gu, Q., Conaghan, P. J., Drummond, B. H., Feng, J., Chotard, F., et al. (2019). Carbene metal amide photoemitters: tailoring conformationally flexible amides for full color range emissions including white-emitting OLED.. Chemical Science, 11 (2), 435-446. https://doi.org/10.1039/c9sc04589a
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.
External DOI: https://doi.org/10.1039/c9sc04589a
This record's URL: https://www.repository.cam.ac.uk/handle/1810/304524
Attribution 4.0 International
Licence URL: https://creativecommons.org/licenses/by/4.0/