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Efficiency Roll-Off...
Efficiency Roll-Off in Light-Emitting Electrochemical Cells
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- Zhang, Xiaoying (author)
- Umeå universitet,Institutionen för fysik,Umeå University, Sweden
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- Ràfols-Ribé, Joan (author)
- Umeå universitet,Institutionen för fysik,Umeå University, Sweden
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- Mindemark, J. (author)
- Department of Chemistry − Ångström Laboratory, Uppsala University, Uppsala, Sweden
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- Tang, Shi (author)
- Umeå universitet,Institutionen för fysik,Umeå University, Sweden
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- Lindh, E Mattias, 1986- (author)
- RISE,Bioraffinaderi och energi,Sustainable Resource Conversion unit, Biorefinery and Energy department, RISE Research Institutes of Sweden AB, Storgatan 65, Umeå, Sweden,Umeå University, Sweden
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- Gracia-Espino, Eduardo (author)
- Umeå universitet,Institutionen för fysik,Umeå University, Sweden
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- Larsen, Christian (author)
- Umeå universitet,Institutionen för fysik,Umeå University, Sweden
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- Edman, Ludvig, 1967- (author)
- Umeå universitet,Institutionen för fysik
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(creator_code:org_t)
- John Wiley and Sons Inc, 2024
- 2024
- English.
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In: Advanced Materials. - : John Wiley and Sons Inc. - 0935-9648 .- 1521-4095. ; 36:15
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Abstract
Subject headings
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- Understanding “efficiency roll-off” (i.e., the drop in emission efficiency with increasing current) is critical if efficient and bright emissive technologies are to be rationally designed. Emerging light-emitting electrochemical cells (LECs) can be cost- and energy-efficiently fabricated by ambient-air printing by virtue of the in situ formation of a p-n junction doping structure. However, this in situ doping transformation renders a meaningful efficiency analysis challenging. Herein, a method for separation and quantification of major LEC loss factors, notably the outcoupling efficiency and exciton quenching, is presented. Specifically, the position of the emissive p-n junction in common singlet-exciton emitting LECs is measured to shift markedly with increasing current, and the influence of this shift on the outcoupling efficiency is quantified. It is further verified that the LEC-characteristic high electrochemical-doping concentration renders singlet-polaron quenching (SPQ) significant already at low drive current density, but also that SPQ increases super-linearly with increasing current, because of increasing polaron density in the p-n junction region. This results in that SPQ dominates singlet-singlet quenching for relevant current densities, and significantly contributes to the efficiency roll-off. This method for deciphering the LEC efficiency roll-off can contribute to a rational realization of all-printed LEC devices that are efficient at highluminance.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Materialteknik (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Materials Engineering (hsv//eng)
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
- NATURVETENSKAP -- Kemi -- Materialkemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Materials Chemistry (hsv//eng)
Keyword
- efficiency roll-off
- light-emitting electrochemical cell
- p-n junction position
- singlet-polaron quenching
- singlet-singlet quenching
- Electrochemical cells
- Excitons
- Light emission
- Polarons
- Semiconductor junctions
- 'current
- Emission efficiencies
- IS costs
- Out-coupling efficiency
- P-n junction
- Quenching
Publication and Content Type
- ref (subject category)
- art (subject category)
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