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Issue 12, 2017
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High-efficiency organic light-emitting diodes of phosphorescent PtAg2 heterotrinuclear acetylide complexes supported by triphosphine

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Abstract

Three PtAg2 heterotrinuclear complexes supported by dpmp [dpmp = bis(diphenylphosphinomethyl)phenylphosphine] were prepared using carbazole-functionalized acetylides with hole-transport character as co-ligands. As established by X-ray crystallography, the PtAg2 array supported by dual dpmp exhibits a centre-symmetric linear arrangement with significant Pt–Ag interaction. They display intense phosphorescence in CH2Cl2 solutions (Φem = 56.9–65.3%) and doping films (Φem = 43.1–71.2%) at room temperature, originating primarily from 3[π(aromatic acetylides) → π*(dpmp)] 3LLCT and 3[π(aromatic acetylides) → s/p(PtAg2)] 3LMCT triplet states mixed with some PtAg2 cluster centred 3[d → s/p] character. Upon doping 8% PtAg2 complexes with blended host materials consisting of hole-transport TCTA and electron-transport OXD-7 as light-emitting layers, high-efficiency solution-processed organic light-emitting diodes were achieved with 67.4 cd A−1 peak current efficiency and 17.4% external quantum efficiency.

Graphical abstract: High-efficiency organic light-emitting diodes of phosphorescent PtAg2 heterotrinuclear acetylide complexes supported by triphosphine

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Supplementary files

Article information


Submitted
23 Jan 2017
Accepted
25 Feb 2017
First published
27 Feb 2017

J. Mater. Chem. C, 2017,5, 3072-3078
Article type
Paper

High-efficiency organic light-emitting diodes of phosphorescent PtAg2 heterotrinuclear acetylide complexes supported by triphosphine

Y. Li, X. Fan, Y. Wu, X. Zeng, J. Wang, Q. Wei and Z. Chen, J. Mater. Chem. C, 2017, 5, 3072
DOI: 10.1039/C7TC00382J

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