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Issue 25, 2011
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Incorporating triphenyl sulfonium salts in polyfluorene PLEDs: an all-organic approach to improved charge injection

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Abstract

All-organic sulfonium salts are introduced as a class of ionic compounds that show high compatibility with conjugated polymers and may form blends with attractive luminescent properties leading to significant improvement in single-layer polymer light emitting diodes' (PLEDs') performance. We demonstrate that triphenylsulfonium (TPS) triflate:polyfluorene-co-benzothiadiazole (F8BT)-blend based PLEDs show a lower turn-on voltage, an increased luminous efficiency and higher peak luminance values. These results are being rationalized in terms of anionic accumulation and space charge formation at the anode side, which facilitates hole injection, leading to more balanced injection and subsequently to a higher recombination rate. Moreover, we find that the salt anion size plays a critical role in the device operating characteristics. The judicious choice of both the salt and the emitting polymer by considering relative energy level alignment, salt electrochemical stability and acquired thermodynamic stability of blend morphology is important for the achievement of high performance PLEDs without requiring elaborate device architectures.

Graphical abstract: Incorporating triphenyl sulfonium salts in polyfluorene PLEDs: an all-organic approach to improved charge injection

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Article information


Submitted
29 Dec 2010
Accepted
26 Apr 2011
First published
25 May 2011

J. Mater. Chem., 2011,21, 9296-9301
Article type
Paper

Incorporating triphenyl sulfonium salts in polyfluorene PLEDs: an all-organic approach to improved charge injection

D. G. Georgiadou, L. C. Palilis, M. Vasilopoulou, G. Pistolis, D. Dimotikali and P. Argitis, J. Mater. Chem., 2011, 21, 9296 DOI: 10.1039/C0JM04567E

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