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Issue 48, 2016
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Horizontal molecular orientation of light-emitting oligofluorenes in spin-coated glassy organic thin films

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Abstract

Horizontal orientation of light-emitting chromophores plays a critical role in the light outcoupling efficiency and the overall performances of organic light-emitting diodes. Here, we demonstrate that such a horizontal orientation of light-emitting molecules can be achieved in solution-processed blends containing highly fluorescent oligofluorenes dispersed into various small molecule host materials. The influences of the host material, the solvent used for the spin-coating, the doping concentration of the oligofluorenes and the oligofluorene chemical structure on these orientational processes are investigated using variable angle spectroscopic ellipsometry and angle-dependent photoluminescence measurements. By clarifying the roles played by these parameters in the horizontal orientation of the emitters, the results provide crucial insights into these molecular orientational processes in spin-coated glassy organic thin films, which should be relevant for the development of high-efficiency solution-processed organic light-emitting diodes in the near future.

Graphical abstract: Horizontal molecular orientation of light-emitting oligofluorenes in spin-coated glassy organic thin films

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Publication details

The article was received on 08 Jul 2016, accepted on 14 Nov 2016 and first published on 14 Nov 2016


Article type: Paper
DOI: 10.1039/C6TC02861F
Citation: J. Mater. Chem. C, 2016,4, 11557-11565

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    Horizontal molecular orientation of light-emitting oligofluorenes in spin-coated glassy organic thin films

    L. Zhao, T. Komino, D. H. Kim, M. H. Sazzad, D. Pitrat, J. Mulatier, C. Andraud, J. Ribierre and C. Adachi, J. Mater. Chem. C, 2016, 4, 11557
    DOI: 10.1039/C6TC02861F

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