Electrophosphorescent Heterobimetallic Oligometallaynes and Their Applications in Solution‐Processed Organic Light‐Emitting Devices |
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Authors: | Prof. Guijiang Zhou Yue He Bing Yao Jingshuang Dang Prof. Wai‐Yeung Wong Prof. Zhiyuan Xie Prof. Xiang Zhao Prof. Lixiang Wang |
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Affiliation: | 1. MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter and Department of Chemistry, Faculty of Science, Xi'an Jiao Tong University, Xi'an 710049 (P.R. China), Fax: (+86)?29‐82663914;2. State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (P.R. China), Fax: (+86)?431‐5684937;3. Institute of Molecular Functional Materials and Department of Chemistry and Centre for Advanced Luminescence Materials, Hong Kong Baptist University, Waterloo Road, Kowloon Tong, Hong Kong (P.R. China), Fax: (+852)?3411‐7348 |
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Abstract: | By combining the iridium(III) ppy‐type complex (Hppy=2‐phenylpyridine) with a square‐planar platinum(II) unit, some novel phosphorescent oligometallaynes bearing dual metal centers (viz. IrIII and PtII) were developed by combining trans‐[Pt(PBu3)2Cl2] with metalloligands of iridium possessing bifunctional pendant acetylene groups. Photophysical and computational studies indicated that the phosphorescent excited states arising from these oligometallaynes can be ascribed to the triplet emissive IrIII ppy‐type chromophore, owing to the obvious trait (such as the longer phosphorescent lifetime at 77 K) also conferred by the PtII center. So, the two different metal centers show a synergistic effect in governing the photophysical behavior of these heterometallic oligometallaynes. The inherent nature of these amorphous materials renders the fabrication of simple solution‐processed doped phosphorescent organic light‐emitting diodes (PHOLEDs) feasible by effectively blocking the close‐packing of the host molecules. Saliently, such a synergistic effect is also important in affording decent device performance for the solution‐processed PHOLEDs. A maximum brightness of 3 356 cd m?2 (or 2 708 cd m?2), external quantum efficiency of 0.50 % (or 0.67 %), luminance efficiency of 1.59 cd A?1 (or 1.55 cd A?1), and power efficiency of 0.60 Lm W?1 (or 0.55 Lm W?1) for the yellow (or orange) phosphorescent PHOLEDs can be obtained. These results show the great potential of these bimetallic emitters for organic light‐emitting diodes. |
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Keywords: | alkynes bimetallic organic light‐emitting diodes phosphorescence polymetallaynes |
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