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Issue 27, 2013
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(C^C*) Cyclometalated binuclear N-heterocyclic biscarbene platinum(II) complexes – highly emissive phosphorescent emitters

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Abstract

A series of bimetallic N-heterocyclic carbene (NHC) platinum(II) complexes with the general formula [Pt(NHC)(L)]2Ph were synthesized, which are composed of two [Pt(NHC)(L)] (L = acetylacetone, dipivaloylmethane or dimesitoylmethane; NHC = 3-methylimidazole or 3-benzylimidazole) fragments. Both fragments are cyclometalated to the same central phenyl ring in the para- or meta-position. All complexes have been fully characterized by standard techniques, two of them additionally by solid-state structures. Photoluminescence properties were investigated and very high quantum yields of 76–93% at room temperature have been observed. For a single-matrix device with an emitter concentration of 30%, a current efficiency of 25 cd A−1, an external quantum efficiency of 8.5%, and a luminance efficiency of 10 lm W−1 were achieved at 300 cd m−2. Density functional theory (DFT) calculations were performed to support experimental data and gain further insight into the photoluminescence behaviour.

Graphical abstract: (C^C*) Cyclometalated binuclear N-heterocyclic biscarbene platinum(ii) complexes – highly emissive phosphorescent emitters

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Publication details

The article was received on 28 Mar 2013, accepted on 28 Apr 2013 and first published on 21 May 2013


Article type: Paper
DOI: 10.1039/C3DT50841B
Citation: Dalton Trans., 2013,42, 9847-9851
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    (C^C*) Cyclometalated binuclear N-heterocyclic biscarbene platinum(II) complexes – highly emissive phosphorescent emitters

    A. Tronnier and T. Strassner, Dalton Trans., 2013, 42, 9847
    DOI: 10.1039/C3DT50841B

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