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Issue 20, 2011
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Pyrene-substituted ethenes: aggregation-enhanced excimer emission and highly efficient electroluminescence

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Abstract

Pyrene-substituted ethenes, 1,2,2-tripheny-1-pyrenylethene (TPPyE) and 1,2-diphenyl-1,2-dipyrenylethene (DPDPyE), are synthesized and characterized. Whereas they are weakly emissive in solution they become strong emitters when aggregated in the condensed phase. In contrast to the general observation that excimer formation quenches the light emission of fluorophores, TPPyE and DPDPyE exhibit efficient excimer emissions in the solid state with high fluorescence quantum yields up to 100%. The π–π intermolecular interactions between the pyrene rings, coupled with multiple C–H⋯π hydrogen bonds, efficiently restrict intramolecular rotations, which block the nonradiative energy decay channel, and hence make the dye molecules highly emissive in the solid state. Non-doped organic light-emitting diodes using TPPyE and DPDPyE as emitters are fabricated, which give green light at low turn-on voltages (down to 3.2 V) with maximum luminance and power, current, and external quantum efficiencies of 49830 cd m−2, 9.2 lm W−1, 10.2 cd A−1 and 3.3%, respectively.

Graphical abstract: Pyrene-substituted ethenes: aggregation-enhanced excimer emission and highly efficient electroluminescence

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Publication details

The article was received on 20 Dec 2010, accepted on 15 Mar 2011 and first published on 11 Apr 2011


Article type: Paper
DOI: 10.1039/C0JM04449K
Citation: J. Mater. Chem., 2011,21, 7210-7216
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    Pyrene-substituted ethenes: aggregation-enhanced excimer emission and highly efficient electroluminescence

    Z. Zhao, S. Chen, J. W. Y. Lam, Z. Wang, P. Lu, F. Mahtab, H. H. Y. Sung, I. D. Williams, Y. Ma, H. S. Kwok and B. Z. Tang, J. Mater. Chem., 2011, 21, 7210
    DOI: 10.1039/C0JM04449K

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