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Printable bifluorene based ultra-violet (UV) organic light-emitting electrochemical cells (OLECs) with improved device performance

Printable bifluorene based ultra-violet (UV) organic light-emitting electrochemical cells (OLECs) with improved device performance
Printable bifluorene based ultra-violet (UV) organic light-emitting electrochemical cells (OLECs) with improved device performance

A series of printable UV emitting ionic bifluorene derivatives have been prepared incorporating pendent alkylimidazolium groups. Herein, we detail the synthesis of compounds and the methods used in device fabrication. We show how ink formulation is improved by increasing the solubility of the active bifluorene through extension of the alkyl chain length and switching the counter ion from PF6 to CF3SO3. We also show how organic light emitting electrochemical cells (OLECs) can be fabricated by spray coating to achieve an active layer with a thickness of ∼150–200 nm, leading to working devices with a turn on voltage of around 6.5 V. This gives electroluminescent (EL) that peaks between 385 nm and 390 nm with a maximum EL emission intensity of 1.29 μW/cm2. Thus, EL emission within the UV range has been demonstrated successfully with the synthesised molecules via spray coating onto glass slides.

E-textiles, Electrochemical cells, Light emitting, Smart fabrics, Ultraviolet emission, Wearable electronics
1566-1199
Arumugam, Sasikumar
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Li, Yi
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Pearce, James E.
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Court, Katie L.
076ff46f-bc11-4103-9b0f-88ac5c52b17c
Piana, Giacomo
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Jackman, Edward H.
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Ward, Oliver J.
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Charlton, Martin D.B.
fcf86ab0-8f34-411a-b576-4f684e51e274
Tudor, John
46eea408-2246-4aa0-8b44-86169ed601ff
Harrowven, David C.
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Beeby, Steve P.
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Arumugam, Sasikumar
bda5c9f3-c979-4129-92a3-eaa50d778f4c
Li, Yi
5c22f4d6-a339-4b3d-a43e-7c55eaf304a7
Pearce, James E.
92f6c797-f640-4b81-8720-78fef0f9a6fe
Court, Katie L.
076ff46f-bc11-4103-9b0f-88ac5c52b17c
Piana, Giacomo
3154f35e-0273-453f-b3b9-97b19d8d856e
Jackman, Edward H.
f9a08c70-b0f2-429f-bd3d-4bab3eb9d65b
Ward, Oliver J.
80fe56a9-50bc-4d8d-8879-8b43b1d0468d
Charlton, Martin D.B.
fcf86ab0-8f34-411a-b576-4f684e51e274
Tudor, John
46eea408-2246-4aa0-8b44-86169ed601ff
Harrowven, David C.
bddcfab6-dbde-49df-aec2-42abbcf5d10b
Beeby, Steve P.
ba565001-2812-4300-89f1-fe5a437ecb0d

Arumugam, Sasikumar, Li, Yi, Pearce, James E., Court, Katie L., Piana, Giacomo, Jackman, Edward H., Ward, Oliver J., Charlton, Martin D.B., Tudor, John, Harrowven, David C. and Beeby, Steve P. (2022) Printable bifluorene based ultra-violet (UV) organic light-emitting electrochemical cells (OLECs) with improved device performance. Organic Electronics, 105, [106513]. (doi:10.1016/j.orgel.2022.106513).

Record type: Article

Abstract

A series of printable UV emitting ionic bifluorene derivatives have been prepared incorporating pendent alkylimidazolium groups. Herein, we detail the synthesis of compounds and the methods used in device fabrication. We show how ink formulation is improved by increasing the solubility of the active bifluorene through extension of the alkyl chain length and switching the counter ion from PF6 to CF3SO3. We also show how organic light emitting electrochemical cells (OLECs) can be fabricated by spray coating to achieve an active layer with a thickness of ∼150–200 nm, leading to working devices with a turn on voltage of around 6.5 V. This gives electroluminescent (EL) that peaks between 385 nm and 390 nm with a maximum EL emission intensity of 1.29 μW/cm2. Thus, EL emission within the UV range has been demonstrated successfully with the synthesised molecules via spray coating onto glass slides.

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Accepted/In Press date: 26 March 2022
e-pub ahead of print date: 1 April 2022
Published date: June 2022
Additional Information: Funding Information: The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: Sasikumar Arumguam reports financial support was provided by University of Southampton . Sasikumar Arumugam reports a relationship with University of Southampton that includes: employment and funding grants. Funding Information: The authors would like to thank the Engineering and Physical Sciences Research Council ( EPSRC ) for funding EP/S005307/1 (Functional electronic textiles for light emitting and colour changing applications) and EP/K039466/1 (Core Capability for Chemistry Research in Southampton), and European Regional Development Fund ( ERDF ) for funding InterReg V project 208 (SmartT: Smart Textiles for Regional Industry and Smart Specialisation Sectors). The work of Steve Beeby was supported by the Royal Academy of Engineering under the Chairs in Emerging Technologies Scheme. All data supporting this study are openly available from the University of Southampton repository at https://doi.org/10.5258/SOTON/D2148 . Publisher Copyright: © 2022 Copyright: Copyright 2022 Elsevier B.V., All rights reserved.
Keywords: E-textiles, Electrochemical cells, Light emitting, Smart fabrics, Ultraviolet emission, Wearable electronics

Identifiers

Local EPrints ID: 456918
URI: http://eprints.soton.ac.uk/id/eprint/456918
ISSN: 1566-1199
PURE UUID: 2c2422f2-b71c-473d-a143-195115bbcd64
ORCID for Sasikumar Arumugam: ORCID iD orcid.org/0000-0002-7783-1799
ORCID for James E. Pearce: ORCID iD orcid.org/0000-0002-8401-2417
ORCID for John Tudor: ORCID iD orcid.org/0000-0003-1179-9455
ORCID for David C. Harrowven: ORCID iD orcid.org/0000-0001-6730-3573
ORCID for Steve P. Beeby: ORCID iD orcid.org/0000-0002-0800-1759

Catalogue record

Date deposited: 17 May 2022 16:38
Last modified: 02 Jul 2022 02:03

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Contributors

Author: Sasikumar Arumugam ORCID iD
Author: Yi Li
Author: James E. Pearce ORCID iD
Author: Katie L. Court
Author: Giacomo Piana
Author: Edward H. Jackman
Author: Oliver J. Ward
Author: Martin D.B. Charlton
Author: John Tudor ORCID iD
Author: Steve P. Beeby ORCID iD

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