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Using phosphorescent PtAu3 clusters for superior solution-processable organic light emitting diodes with very small efficiency roll-off

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Abstract

A family of highly phosphorescent PtM3 (M = Au, Ag) aromatic acetylide cluster complexes supported with tetraphosphine and stabilized by μ-chloride were synthesized by the use of weakly luminescent mononuclear Pt(PPh3)2(C[triple bond, length as m-dash]CR)2 (R = aryl) as precursors. The formation of PtM3 cluster complexes involves the abstraction of chloride from dichloromethane. The dramatic difference between PtAg3 and PtAu3 cluster structures arises from the location of the Pt atom, which is at the center of the triangle-planar PtM3 cluster for M = Ag whereas at one of the three corners in the PtM3 triangle plane for M = Au. Perturbation of the chloride ion in complexation by using a halide-abstracting agent results in the formation of PtM2 heterotrinuclear structures as demonstrated by X-ray crystallography. The PtAu3 complexes display intense phosphorescence with quantum yields of over 90% in doped films. High-efficiency OLEDs based on PtAu3 complexes were attained with an external quantum efficiency (EQE) over 18%. Most importantly, the optimized devices exhibit extremely small efficiency roll-off (less than 1%) at a practical brightness over 1000 cd m−2, which is one of the best performances for solution-processable phosphorescent OLEDs.

Graphical abstract: Using phosphorescent PtAu3 clusters for superior solution-processable organic light emitting diodes with very small efficiency roll-off

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Publication details

The article was received on 04 Jul 2018, accepted on 02 Aug 2018 and first published on 02 Aug 2018


Article type: Paper
DOI: 10.1039/C8TC03270J
Citation: J. Mater. Chem. C, 2018, Advance Article
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    Using phosphorescent PtAu3 clusters for superior solution-processable organic light emitting diodes with very small efficiency roll-off

    N. Natarajan, L. Shi, H. Xiao, J. Wang, L. Zhang, X. Zhang and Z. Chen, J. Mater. Chem. C, 2018, Advance Article , DOI: 10.1039/C8TC03270J

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