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Dinuclear Platinum(II) Complex Dominated by a Zig-Zag-Type Cyclometalated Ligand:An New Approach to Realize High-efficiency Near Infrared Emission

Abstract

Two new zig-zag typy 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 of 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 increasing photoluminescent efficiency of 3.64%and a red-shifted near-infrared (NIR) emission peaked at 718 nm owing to its enhanced rigid planar structure ina nitrogen atmosphere. As a result, only (BuPh-BDIQ)Pt2(dpm)2 presented NIRelectroluminescent emission in their doped polymeric light-emitting diodes. The highest external quantum efficiency of 0.97% and a radiant intensity of 146 μW/cm2 were observed in the device at 2 wt% dopant concentration, which is higher than those values of the previous NIR- emitting di-nuclear platinum complexes constructed by cyclometalated ligands. Further more, the efficiency roll-off was efficiently inhibited. It indicates that high-efficiency NIR-emitting di-nuclear platinum complexes can be obtained by designing zig-zag type C^N-C^N tetradentate cyclo- metalating ligand with a big rigid planar saw band.

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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, Accepted Manuscript
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    Dinuclear Platinum(II) Complex Dominated by a Zig-Zag-Type Cyclometalated Ligand:An 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, Accepted Manuscript , DOI: 10.1039/C8TC01142G

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