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Bipolar Electrode Array Embedded in a Polymer Light-Emitting Electrochemical Cell

Bipolar Electrode Array Embedded in a Polymer Light-Emitting Electrochemical Cell

Authors :
Laurent Bouffier
Faleh AlTal
Guillaume Wantz
Shulun Chen
Shiyu Hu
Jun Gao
Biodiversité, Gènes et Communautés
Institut National de la Recherche Agronomique (INRA)
Laboratoire de l'intégration, du matériau au système (IMS)
Université Sciences et Technologies - Bordeaux 1-Institut Polytechnique de Bordeaux-Centre National de la Recherche Scientifique (CNRS)
Biodiversité, Gènes & Communautés (BioGeCo)
Institut National de la Recherche Agronomique (INRA)-Université de Bordeaux (UB)
Centre National de la Recherche Scientifique (CNRS)-Institut Polytechnique de Bordeaux-Université Sciences et Technologies - Bordeaux 1
Source :
ACS Applied Materials & Interfaces, ACS Applied Materials & Interfaces, Washington, D.C. : American Chemical Society, 2017, 9 (37), pp.32405-32410. ⟨10.1021/acsami.7b11204⟩
Publication Year :
2017
Publisher :
HAL CCSD, 2017.

Abstract

A linear array of aluminum discs is deposited between the driving electrodes of an extremely large planar polymer light-emitting electrochemical cell (PLEC). The planar PLEC is then operated at a constant bias voltage of 100 V. This promotes in situ electrochemical doping of the luminescent polymer from both the driving electrodes and the aluminum discs. These aluminum discs function as discrete bipolar electrodes (BPEs) that can drive redox reactions at their extremities. Time-lapse fluorescence imaging reveals that p- and n-doping that originated from neighboring BPEs can interact to form multiple light-emitting p–n junctions in series. This provides direct evidence of the working principle of bulk homojunction PLECs. The propagation of p-doping is faster from the BPEs than from the positive driving electrode due to electric field enhancement at the extremities of BPEs. The effect of field enhancement and the fact that the doping fronts only need to travel the distance between the neighboring BPEs to form a light-emitting junction greatly reduce the response time for electroluminescence in the region containing the BPE array. The near simultaneous formation of multiple light-emitting p–n junctions in series causes a measurable increase in cell current. This indicates that the region containing a BPE is much more conductive than the rest of the planar cell despite the latter’s greater width. The p- and n-doping originating from the BPEs is initially highly confined. Significant expansion and divergence of doping occurred when the region containing the BPE array became more conductive. The shape and direction of expanded doping strongly suggest that the multiple light-emitting p–n junctions, formed between and connected by the array of metal BPEs, have functioned as a single rod-shaped BPE. This represents a new type of BPE that is formed in situ and as a combination of metal, doped polymers, and forward-biased p–n junctions connected in series.

Details

Language :
English
ISSN :
19448244 and 19448252
Database :
OpenAIRE
Journal :
ACS Applied Materials & Interfaces, ACS Applied Materials & Interfaces, Washington, D.C. : American Chemical Society, 2017, 9 (37), pp.32405-32410. ⟨10.1021/acsami.7b11204⟩
Accession number :
edsair.doi.dedup.....50fefb363f4d15175a263e0e05e669c2
Full Text :
https://doi.org/10.1021/acsami.7b11204⟩