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Issue 21, 2018
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Dinuclear platinum(II) complex dominated by a zig-zag-type cyclometalated ligand: a new approach to realize high-efficiency near infrared emission

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Abstract

Two new zig-zag type di- and mono-nuclear platinum(II) complexes of (BuPh-BDIQ)Pt2(dpm)2 and (BuPh-BDIQ)Ptdpm were synthesized and characterized by using a zig-zag type cyclometalating ligand 3,10-di(tert-butyl)-5,12-bis(4-(tert-butyl)phenyl)-benzodiisoquinoline (BuPh-BDIQ). Their single-crystal structures, and photophysical, electrochemical and electroluminescent properties were primarily investigated. Compared with (BuPh-BDIQ)Ptdpm, (BuPh-BDIQ)Pt2(dpm)2 exhibited a significantly increased photoluminescent efficiency of 3.64% and a red-shifted near-infrared (NIR) emission peak at 718 nm owing to its enhanced rigid planar structure in a nitrogen atmosphere. As a result, only (BuPh-BDIQ)Pt2(dpm)2 presented NIR electroluminescent emission in a doped polymeric light-emitting diode. The highest external quantum efficiency of 0.97% and a radiant intensity of 146 μW cm−2 were observed for the device at 2 wt% dopant concentration, which is higher than the values of previous NIR-emitting di-nuclear platinum complexes constructed with cyclometalated ligands. Furthermore, efficiency roll-off was efficiently inhibited. This indicates that high-efficiency NIR-emitting di-nuclear platinum complexes can be obtained by designing a zig-zag type C^N–C^N tetradentate cyclometalating ligand with a big rigid planar saw band.

Graphical abstract: Dinuclear platinum(ii) complex dominated by a zig-zag-type cyclometalated ligand: a new approach to realize high-efficiency near infrared emission

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Publication details

The article was received on 08 Mar 2018, accepted on 27 Apr 2018 and first published on 28 Apr 2018


Article type: Paper
DOI: 10.1039/C8TC01142G
Citation: J. Mater. Chem. C, 2018,6, 5769-5777
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    Dinuclear platinum(II) complex dominated by a zig-zag-type cyclometalated ligand: a new approach to realize high-efficiency near infrared emission

    S. Yang, F. Meng, X. Wu, Z. Yin, X. Liu, C. You, Y. Wang, S. Su and W. Zhu, J. Mater. Chem. C, 2018, 6, 5769
    DOI: 10.1039/C8TC01142G

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