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Self-Heating in Lig...
Self-Heating in Light-Emitting Electrochemical Cells
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- Ràfols-Ribé, Joan (author)
- Umeå universitet,Institutionen för fysik,Umea Univ, Sweden
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- Robinson, Nathaniel D (author)
- Linköpings universitet,Sensor- och aktuatorsystem,Tekniska fakulteten
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- Larsen, Christian (author)
- Umeå universitet,Institutionen för fysik,Umea Univ, Sweden
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- Tang, Shi (author)
- Umeå universitet,Institutionen för fysik,Umea Univ, Sweden
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- Top, Michiel (author)
- Fraunhofer Inst Organ Elect Electron Beam & Plasm, Germany
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- Sandström, Andreas (author)
- Umeå universitet,Institutionen för fysik,Umea Univ, Sweden
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- Edman, Ludvig, 1967- (author)
- Umeå universitet,Institutionen för fysik,Umea Univ, Sweden
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(creator_code:org_t)
- 2020-03-13
- 2020
- English.
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In: Advanced Functional Materials. - : Wiley-VCH Verlagsgesellschaft. - 1616-301X .- 1616-3028. ; 30:33
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Abstract
Subject headings
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- 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.
Subject headings
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
- TEKNIK OCH TEKNOLOGIER -- Maskinteknik -- Energiteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Mechanical Engineering -- Energy Engineering (hsv//eng)
Keyword
- heat management
- light-emitting electrochemical cells
- self-heating
- substrate properties
- temperature-dependent performance
Publication and Content Type
- ref (subject category)
- for (subject category)
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