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Effect of triphenylsulfonium triflate addition in wide band-gap polymer light-emitting diodes: improved charge injection, transport and electroplex-induced emission tuning

Effect of triphenylsulfonium triflate addition in wide band-gap polymer light-emitting diodes: improved charge injection, transport and electroplex-induced emission tuning
Effect of triphenylsulfonium triflate addition in wide band-gap polymer light-emitting diodes: improved charge injection, transport and electroplex-induced emission tuning

The presence of mobile anions in the emitting layer of polymer-based OLEDs has been proven to influence substantially the injection characteristics of the diode. In this work we report on the improvement of both injection and transport of charge carriers in blue emitting poly[2-(6-cyano-6-methyl-heptyloxy)-1,4- phenylene] (CN-PPP) based OLEDs upon insertion of the all-organic triphenylsulfonium (TPS) triflate salt in the emitting layer. On one hand, the anion displacement influences the energetics at the polymer/anode interface facilitating hole injection, whereas, on the other hand, the triphenylsulfonium cations act as electron transporting sites. The OLEDs exhibit significantly reduced turn-on voltage to half their initial value and increased luminance at low operating voltage. Moreover, the large energetic mismatch of the polymer and the triphenylsulfonium salt as well as the polarity induced by the ions result in simultaneous dual emission originating from the polymer exciton and from an electroplex, which is proposed to be formed at the triphenylsulfonium salt/polymer interfaces in the bulk. These results show that triphenylsulfonium salts represent an attractive class of materials that can be blended with conjugated polymers and can modify their electrical and/or emissive characteristics.

2046-2069
11786-11792
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 (2012) Effect of triphenylsulfonium triflate addition in wide band-gap polymer light-emitting diodes: improved charge injection, transport and electroplex-induced emission tuning. RSC Advances, 2 (31), 11786-11792. (doi:10.1039/c2ra21709k).

Record type: Article

Abstract

The presence of mobile anions in the emitting layer of polymer-based OLEDs has been proven to influence substantially the injection characteristics of the diode. In this work we report on the improvement of both injection and transport of charge carriers in blue emitting poly[2-(6-cyano-6-methyl-heptyloxy)-1,4- phenylene] (CN-PPP) based OLEDs upon insertion of the all-organic triphenylsulfonium (TPS) triflate salt in the emitting layer. On one hand, the anion displacement influences the energetics at the polymer/anode interface facilitating hole injection, whereas, on the other hand, the triphenylsulfonium cations act as electron transporting sites. The OLEDs exhibit significantly reduced turn-on voltage to half their initial value and increased luminance at low operating voltage. Moreover, the large energetic mismatch of the polymer and the triphenylsulfonium salt as well as the polarity induced by the ions result in simultaneous dual emission originating from the polymer exciton and from an electroplex, which is proposed to be formed at the triphenylsulfonium salt/polymer interfaces in the bulk. These results show that triphenylsulfonium salts represent an attractive class of materials that can be blended with conjugated polymers and can modify their electrical and/or emissive characteristics.

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More information

Accepted/In Press date: 2 October 2012
e-pub ahead of print date: 2 October 2012
Published date: 7 December 2012

Identifiers

Local EPrints ID: 440515
URI: http://eprints.soton.ac.uk/id/eprint/440515
ISSN: 2046-2069
PURE UUID: 959789f0-8f21-4c62-8466-b86c9b9fed5c
ORCID for Dimitra G. Georgiadou: ORCID iD orcid.org/0000-0002-2620-3346

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Date deposited: 06 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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