The dynamic emission zone in sandwich polymer light‐emitting electrochemical cells

Diethelm, Matthias; Schiller, Andreas; Kawecki, Maciej; Devižis, Andrius; Blülle, Balthasar; Jenatsch, Sandra; Knapp, Evelyne; Grossmann, Quirin; Ruhstaller, Beat; Nüesch, Frank; Hany, Roland

doi:10.1002/adfm.201906803

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
Title:	The dynamic emission zone in sandwich polymer light‐emitting electrochemical cells
Authors:	Diethelm, Matthias Schiller, Andreas Kawecki, Maciej Devižis, Andrius Blülle, Balthasar Jenatsch, Sandra Knapp, Evelyne Grossmann, Quirin Ruhstaller, Beat Nüesch, Frank Hany, Roland
et. al:	No
DOI:	10.1002/adfm.201906803
Published in:	Advanced Functional Materials
Volume(Issue):	2019
Issue:	1906803
Issue Date:	25-Nov-2019
Publisher / Ed. Institution:	Wiley
ISSN:	1616-301X 1616-3028
Language:	English
Subject (DDC):	540: Chemistry
Abstract:	In light‐emitting electrochemical cells (LECs), the position of the emission zone (EZ) is not predefined via a multilayer architecture design, but governed by a complex motion of electrical and ionic charges. As a result of the evolution of doped charge transport layers that enclose a dynamic intrinsic region until steady state is reached, the EZ is often dynamic during turn‐on. For thick sandwich polymer LECs, a continuous change of the emission color provides a direct visual indication of a moving EZ. Results from an optical and electrical analysis indicate that the intrinsic zone is narrow at early times, but starts to widen during operation, notably well before the electrical device optimum is reached. Results from numerical simulations demonstrate that the only precondition for this event to occur is that the mobilities of anions (µa) and cations (µc) are not equal, and the direction of the EZ shift dictates µc > µa. Quantitative ion profiles reveal that the displacement of ions stops when the intrinsic zone stabilizes, confirming the relation between ion movement and EZ shift. Finally, simulations indicate that the experimental current peak for constant‐voltage operation is intrinsic and the subsequent decay does not result from degradation, as commonly stated.
URI:	https://www.dora.lib4ri.ch/empa/islandora/object/empa:21596 https://digitalcollection.zhaw.ch/handle/11475/19345
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Appears in collections:	Publikationen School of Engineering

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Diethelm, M., Schiller, A., Kawecki, M., Devižis, A., Blülle, B., Jenatsch, S., Knapp, E., Grossmann, Q., Ruhstaller, B., Nüesch, F., & Hany, R. (2019). The dynamic emission zone in sandwich polymer light‐emitting electrochemical cells. Advanced Functional Materials, 2019(1906803). https://doi.org/10.1002/adfm.201906803

Diethelm, M. et al. (2019) ‘The dynamic emission zone in sandwich polymer light‐emitting electrochemical cells’, Advanced Functional Materials, 2019(1906803). Available at: https://doi.org/10.1002/adfm.201906803.

M. Diethelm et al., “The dynamic emission zone in sandwich polymer light‐emitting electrochemical cells,” Advanced Functional Materials, vol. 2019, no. 1906803, Nov. 2019, doi: 10.1002/adfm.201906803.

DIETHELM, Matthias, Andreas SCHILLER, Maciej KAWECKI, Andrius DEVIŽIS, Balthasar BLÜLLE, Sandra JENATSCH, Evelyne KNAPP, Quirin GROSSMANN, Beat RUHSTALLER, Frank NÜESCH und Roland HANY, 2019. The dynamic emission zone in sandwich polymer light‐emitting electrochemical cells. Advanced Functional Materials [online]. 25 November 2019. Bd. 2019, Nr. 1906803. DOI 10.1002/adfm.201906803. Verfügbar unter: https://www.dora.lib4ri.ch/empa/islandora/object/empa:21596

Diethelm, Matthias, Andreas Schiller, Maciej Kawecki, Andrius Devižis, Balthasar Blülle, Sandra Jenatsch, Evelyne Knapp, et al. 2019. “The Dynamic Emission Zone in Sandwich Polymer Light‐Emitting Electrochemical Cells.” Advanced Functional Materials 2019 (1906803). https://doi.org/10.1002/adfm.201906803.

Diethelm, Matthias, et al. “The Dynamic Emission Zone in Sandwich Polymer Light‐Emitting Electrochemical Cells.” Advanced Functional Materials, vol. 2019, no. 1906803, Nov. 2019, https://doi.org/10.1002/adfm.201906803.