Inkjet Printed Bilayer Light-Emitting Electrochemical Cells for Display and Lighting Applications
2014 (English)In: Small, ISSN 1613-6810, E-ISSN 1613-6829, Vol. 10, no 20, 4148-4153 p.Article in journal (Refereed) Published
A new bilayer light-emitting electrochemical cell (LEC) device, which allows well-defined patterned light emission through an easily adjustable, mask-free, and additive fabrication process, is reported. The bilayer stack comprises an inkjet-printed lattice of micrometer-sized electrolyte droplets, in a filled or patterned lattice configuration. On top of this, a thin layer of light-emitting compound is deposited from solution. The light emission is demonstrated to originate from regions proximate to the interfaces between the inkjetted electrolyte, the light-emitting compound, and one electrode, where bipolar electron/hole injection and electrochemical doping are facilitated by ion motion. By employing KCF3SO3 in poly(ethylene glycol) as the electrolyte, Super Yellow as the light-emitting compound, and two air-stabile electrodes, it is possible to realize filled lattice devices that feature uniform yellow-green light emission to the naked eye, and patterned lattice devices that deliver well-defined and high-contrast static messages with a pixel density of 170 PPI.
Place, publisher, year, edition, pages
John Wiley & Sons, 2014. Vol. 10, no 20, 4148-4153 p.
inkjet printing, light-emitting electrochemical cells, displays, patterning, conjugated polymers
IdentifiersURN: urn:nbn:se:umu:diva-96951DOI: 10.1002/smll.201400840ISI: 000344452500015OAI: oai:DiVA.org:umu-96951DiVA: diva2:790550