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

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

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.

0959-9428
9296-9301
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 (2011) Incorporating triphenyl sulfonium salts in polyfluorene PLEDs: an all-organic approach to improved charge injection. Journal of Materials Chemistry, 21 (25), 9296-9301. (doi:10.1039/c0jm04567e).

Record type: Article

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.

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More information

Accepted/In Press date: 26 April 2011
e-pub ahead of print date: 25 May 2011
Published date: 7 July 2011

Identifiers

Local EPrints ID: 440512
URI: http://eprints.soton.ac.uk/id/eprint/440512
ISSN: 0959-9428
PURE UUID: 5b8c0f40-a4a4-467e-b8a1-8267fbc9536b
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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