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In Quest of Printed Electrodes for Light-emitting Electrochemical Cells: A Comparative Study between Two Silver Inks
Umeå University, Faculty of Science and Technology, Department of Physics. (The Organic Photonics and Electronics Group (OPEG))
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesis
Abstract [en]

This thesis presents a comparative study between two silver nanoparticle inks that were deposited using a Drop-on-Demand (DoD) inkjet printer, aiming at finding a functional ink that can be used to print electrodes in Light-emitting Electrochemical Cells (LECs). To achieve this, a DoD inkjet printer was installed and an acquaintance with the printer was attained. Among the two inks, one was employed as received while the other was reformulated, and successful deposition of both the inks was observed. During the reformulation process, it was seen that the highly volatile tetrahydrofuran (THF) solvent can be used to improve the ink properties, in contrast to what is recommended. After that, the inks were deposited on UV-ozone treated glass substrates, sintered at an elevated temperature under ambient conditions, and their specific resistances and thicknesses were measured. Finally, the inks were used to print the anode in a structured sandwich-cell LEC. The performance comparison was conducted by observing the emitted light of the LECs. The results indicate that the reformulated ink performs better, probably due to the lower silver concentration that results in flatter surface, which in turn effectively alleviates shorts.

Place, publisher, year, edition, pages
2012. , 45 p.
Keyword [en]
LEC, light-emitting electrochemical cells, conductive nano-particle inks, silver inks, inkjet printer, organic electronics
National Category
Other Physics Topics
URN: urn:nbn:se:umu:diva-62827OAI: diva2:578790
Educational program
Master's Programme in Physics
2012-12-10, Bottenhavet, plan 2, nstitutionen för fysik, Linnaeus väg 24 901 87, Umeå, 01:00 (English)
Physics, Chemistry, Mathematics
Available from: 2012-12-19 Created: 2012-12-19 Last updated: 2012-12-19Bibliographically approved

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