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Fundamental Tradeoff between Emission Intensity and Efficiency in Light-Emitting Electrochemical Cells
Eindhoven University of Technology, Netherlands.
Eindhoven University of Technology, Netherlands; Eindhoven University of Technology, Netherlands.
Linköping University, Department of Physics, Chemistry and Biology, Complex Materials and Devices. Linköping University, The Institute of Technology. Eindhoven University of Technology, Netherlands.ORCID iD: 0000-0002-7104-7127
2015 (English)In: Advanced Functional Materials, ISSN 1616-301X, E-ISSN 1616-3028, Vol. 25, no 20, 3066-3073 p.Article in journal (Refereed) Published
Abstract [en]

The characteristic doping process in polymer light-emitting electrochemical cells (LECs) causes a tradeoff between luminescence intensity and efficiency. Experiments and numerical modeling on thin film polymer LECs show that, on the one hand, carrier injection and transport benefit from electrochemical doping, leading to increased electron-hole recombination. On the other hand, the radiative recombination efficiency is reduced by exciton quenching by polarons involved in the doping. Consequently, the quasi-steady-state luminescent efficiency decreases with increasing ion concentration. The transient of the luminescent efficiency shows a characteristic roll-off while the current continuously increases, attributed to ongoing electrochemical doping and the associated exciton quenching. Both effects can be modeled by exciton polaron-quenching via diffusion-assisted Forster resonance energy transfer. These results indicate that the tradeoff between efficiency and intensity is fundamental, suggesting that the application realm of future LECs should be sought in high-brightness, low-production cost devices, rather than in high-efficiency devices.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2015. Vol. 25, no 20, 3066-3073 p.
Keyword [en]
charge transport; conjugated polymers; doping; organic light-emitting electrochemical cells; recombination
National Category
Physical Sciences
URN: urn:nbn:se:liu:diva-119585DOI: 10.1002/adfm.201403945ISI: 000355125400013OAI: diva2:825159

Funding Agencies|NanoNextNL, a micro and nanotechnology consortium of the Government of the Netherlands; [NNNL.06D.04]

Available from: 2015-06-23 Created: 2015-06-22 Last updated: 2016-05-27

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