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  4. Self-Heating in Light-Emitting Electrochemical Cells
 
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2020
  • Zeitschriftenaufsatz

Titel

Self-Heating in Light-Emitting Electrochemical Cells

Abstract
Electroluminescent devices become warm during operation, and their performance can, therefore, be severely limited at high drive current density. Herein, the effects of this self‐heating on the operation of a light‐emitting electrochemical cell (LEC) are systematically studied. A drive current density of 50 mA cm−2 can result in a local device temperature for a free‐standing LEC that exceeds 50 °C within a short period of operation, which in turn induces premature device degradation as manifested in the rapidly decreasing luminance and increasing voltage. Furthermore, this undesired self‐heating for a free‐standing thin‐film LEC can be suppressed by the employment of a device architecture featuring high thermal conductance and a small emission‐area fill factor, since the corresponding improved heat conduction to the nonemissive regions facilitates more efficient heat transfer to the ambient surroundings. In addition, the reported differences in performance between small‐area and large‐area LECs as well as between flexible‐plastic and rigid‐glass LECs are rationalized, culminating in insights that can be useful for the rational design of LEC devices with suppressed self‐heating and high performance.
Author(s)
Ràfols-Ribé, J.
The Organic Photonics and Electronics Group, Umeå University, Umeå, SE-90187, Sweden
Robinson, N.D.
Transport and Separations Group, Department of Physics, Chemistry and Biology, Linköping University, Linköping SE-58183, Sweden
Larson, C.
The Organic Photonics and Electronics Group, Umeå University, Umeå, SE-90187, Sweden
Tang, S.
Top, M.
Fraunhofer-Institut für Organische Elektronik, Elektronenstrahl- und Plasmatechnik FEP
Sandström, A.
The Organic Photonics and Electronics Group, Umeå University, Umeå, SE-90187, Sweden
Erdmann, L.
The Organic Photonics and Electronics Group, Umeå University, Umeå, SE-90187, Sweden
Zeitschrift
Advanced Functional Materials
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DOI
10.1002/adfm.201908649
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Language
Englisch
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Tags
  • LED

  • OLED

  • light-emitting

  • electrochemical cells...

  • self-heating

  • substrate properties

  • temperature-dependent...

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