Inkjet Printed Bilayer Light‐Emitting Electrochemical Cells for Display and Lighting Applications. Issue 20 (28th July 2014)

• Record Type: Journal Article
• Authors: Lindh, E. Mattias; Sandström, Andreas; Edman, Ludvig
• Is Part Of: Small. Volume 10:Issue 20(2014:Oct.)
• Page Start: 4148
• Page End: 4153
• Publication Date: 2014-07-28
• Subjects: Nanotechnology -- Periodicals; Nanoparticles -- Periodicals; Microtechnology -- Periodicals; 620.5
• DOI: 10.1002/smll.201400840
• Languages: English
• ISSNs: 1613-6810

Abstract

<abstract abstract-type="main" xml:lang="en"> <title> <x xml:space="preserve">Abstract</x> </title> <p>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.</p> </abstract>