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TitleBilayer Light-Emitting Electrochemical Cells for Signage and Lighting Applications
File Size2.2 MB
Total Pages40
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E. Mattias Lindh, A. Sandström, L. Edman
Inkjet Printed Bilayer Light-Emitting Electrochemical Cells for Display and Lighting
Small, 10(20), 4148–4153, (2014)

We present an additive patterning method of bilayer light-emitting electrochemical
cells. The electrolyte is separately deposited with the aid of an inkjet printer before
deposition of an organic semiconductor. The light-emission from the devices
corresponds directly to the positions of the electrolyte droplets because the
electrolyte is needed for charge injection and concomitant LEC functionality. To
expose the merits of the concept we present a microscopic signage device with a
pixel density of 170 PPI, and a device that feature homogeneous emission to the
naked eye.

E. Mattias Lindh, A. Sandström, M. Andersson, L. Edman
Luminescent Line Art by Direct-Write Patterning
In press Light: Science & Applications, 5, e16050, (2016)

We subtractively pattern a bilayer light-emitting electrochemical cell by the direct
writing with a stylus in an otherwise continuous electrolyte film. This gives highly
versatile electroluminescent line-art patterns and we show that the system is robust
both in terms of fabrication and choice of materials. The operational functionality of
the devices is deduced from an optical microscopy study, from which we conclude
that cation-assisted electron injection at the cathode, and the electronically
insulating properties of the electrolyte at the anode, determine the light-emitting
region. We further note that cations can drift through the investigated organic
semiconductors and that the lateral cationic diffusion length is limited to less than
one micrometer in the investigated organic semiconductors.

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