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Influence of the anion on the optoelectronic characteristics of triphenylsulfonium salts modified polymer light emitting devices

Influence of the anion on the optoelectronic characteristics of triphenylsulfonium salts modified polymer light emitting devices
Influence of the anion on the optoelectronic characteristics of triphenylsulfonium salts modified polymer light emitting devices

Triphenylsulfonium salts addition in the emitting layer of polymer light emitting diodes (PLEDs) has been shown to be beneficial for charge injection and transport due to both ionic effects and π-conjugation in the phenyl rings of the cation. In some cases the emission profile can be also modified through an electroplex formation. Herein we investigate the effect of four TPS-salts with different counter anions on the overall PLED performance upon blending each salt with the conjugated polymer poly[2-(6-cyano-6-methyl-heptyloxy)-1,4-phenylene] (CN-PPP). In particular, three perfluoroalkanesulfonate organic anions of increasing size (triflate, nonaflate, PFOS) and a perfluorinated inorganic anion (SbF6) are compared. It is shown that the anion size affects primarily the turn-on and operational voltage, whereas its chemical nature is crucial for achieving high luminance values. The counteranion exerts also a direct impact on the dispersion properties of the salt in the polymer matrix, and thus, the film morphology, which in turn influences the emission colour and efficiency of an electroplex that is proposed to be formed at the sulfonium salt/polymer interfaces in the bulk. This study highlights the importance of properly selecting the counterions of the salts added in the emitting layer of PLEDs, which, in addition to their various functionalities, significantly influence device performance.

AFM phase imaging, Electroplex, Ionic transport, OLEDs, Perfluorinated anions, Photoacid generators
0379-6779
37-44
Georgiadou, Dimitra G.
84977176-3678-4fb3-a3dd-2044a49c853b
Palilis, Leonidas C.
b09e9554-54da-4be5-aa08-bda894e2b86f
Vasilopoulou, Maria
aad1381e-d091-4090-8c7c-b74bed22393d
Pistolis, George
2a710db0-c97d-44bb-8ffc-896a7cd2a087
Dimotikali, Dimitra
9c6d5002-c742-4576-b6dc-048acb0f1420
Argitis, Panagiotis
ab9c4ea6-3dd2-4e34-935d-81bfb360f358
Georgiadou, Dimitra G.
84977176-3678-4fb3-a3dd-2044a49c853b
Palilis, Leonidas C.
b09e9554-54da-4be5-aa08-bda894e2b86f
Vasilopoulou, Maria
aad1381e-d091-4090-8c7c-b74bed22393d
Pistolis, George
2a710db0-c97d-44bb-8ffc-896a7cd2a087
Dimotikali, Dimitra
9c6d5002-c742-4576-b6dc-048acb0f1420
Argitis, Panagiotis
ab9c4ea6-3dd2-4e34-935d-81bfb360f358

Georgiadou, Dimitra G., Palilis, Leonidas C., Vasilopoulou, Maria, Pistolis, George, Dimotikali, Dimitra and Argitis, Panagiotis (2013) Influence of the anion on the optoelectronic characteristics of triphenylsulfonium salts modified polymer light emitting devices. Synthetic Metals, 181, 37-44. (doi:10.1016/j.synthmet.2013.08.002).

Record type: Article

Abstract

Triphenylsulfonium salts addition in the emitting layer of polymer light emitting diodes (PLEDs) has been shown to be beneficial for charge injection and transport due to both ionic effects and π-conjugation in the phenyl rings of the cation. In some cases the emission profile can be also modified through an electroplex formation. Herein we investigate the effect of four TPS-salts with different counter anions on the overall PLED performance upon blending each salt with the conjugated polymer poly[2-(6-cyano-6-methyl-heptyloxy)-1,4-phenylene] (CN-PPP). In particular, three perfluoroalkanesulfonate organic anions of increasing size (triflate, nonaflate, PFOS) and a perfluorinated inorganic anion (SbF6) are compared. It is shown that the anion size affects primarily the turn-on and operational voltage, whereas its chemical nature is crucial for achieving high luminance values. The counteranion exerts also a direct impact on the dispersion properties of the salt in the polymer matrix, and thus, the film morphology, which in turn influences the emission colour and efficiency of an electroplex that is proposed to be formed at the sulfonium salt/polymer interfaces in the bulk. This study highlights the importance of properly selecting the counterions of the salts added in the emitting layer of PLEDs, which, in addition to their various functionalities, significantly influence device performance.

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More information

e-pub ahead of print date: 6 September 2013
Published date: 17 September 2013
Keywords: AFM phase imaging, Electroplex, Ionic transport, OLEDs, Perfluorinated anions, Photoacid generators

Identifiers

Local EPrints ID: 439806
URI: http://eprints.soton.ac.uk/id/eprint/439806
ISSN: 0379-6779
PURE UUID: 3a18a5dd-19df-4b5a-b3dc-1860029cdcf6
ORCID for Dimitra G. Georgiadou: ORCID iD orcid.org/0000-0002-2620-3346

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Date deposited: 05 May 2020 16:30
Last modified: 07 Oct 2020 02:27

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Contributors

Author: Leonidas C. Palilis
Author: Maria Vasilopoulou
Author: George Pistolis
Author: Dimitra Dimotikali
Author: Panagiotis Argitis

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