Recent Advances in Research and Development of Microfluidic Organic Light-Emitting Devices

Abstract

Liquid organic semiconductors (LOSs) have been an attractive class of functional materials for next generation organic electronic devices. In 2009, a liquid organic light-emitting diode (Liquid OLED), which consists of LOS in the active layer, was proposed by Xu and Adachi. Although several papers have reported on an improvement in device performance, from the viewpoint of the device architecture, there are challenges associated with multi-color electroluminescence (EL) emissions. In order to integrate multiple individual liquid OLEDs on one substrate, we have developed multi-color microfluidic OLEDs which have single-m-thick microchannels sandwiched between two electrodes. This paper presents a brief overview of the authors' own recent progress on the microfluidic OLED technologies, including fabrication methodology for electro-microfluidic devices and demonstration of multi-and white-color EL emissions using pyrene-based LOSs. We believe that the proposed microfluidic OLEDs can be promising for novel liquid-based device applications.

Rapid Fabrication Method for Soft Devices Using Off‐the‐Shelf Conductive and Dielectric Acrylic Elastomers

“…Soft devices and transducers are often composed of compliant electrodes and elastomeric substrates (e.g., silicone and acrylic elastomers [AEs]). Researchers have demonstrated stretchable devices in different forms with various electrode materials, such as carbon black and grease, [ 18–20 ] silver inks, [ 21,22 ] carbon nanotubes, [ 23–25 ] graphite, [ 26,27 ] graphene, [ 28,29 ] liquid metals, [ 30,31 ] elastomers, [ 32,33 ] and fabrics. [ 34,35 ] While the devices made of these conductive materials function well, most of them require a time‐consuming process involving preparation, patterning, and curing, associated with a dedicated fabrication setup and environment.…”

“…carbon nanotubes, [23][24][25] graphite, [26,27] graphene, [28,29] liquid metals, [30,31] elastomers, [32,33] and fabrics. [34,35] While the devices made of these conductive materials function well, most of them require a timeconsuming process involving preparation, patterning, and curing, associated with a dedicated fabrication setup and environment.…”

Three-Dimensional Analysis of Liquid Propagation at Microchannel Junction using ESEM

“…In recent years, the three-dimensional microfluidic devices have been actively studied in varieties of fields such as electric, biological, and medical industries [1][2][3][4][5][6]. For extension to the threedimensional, the micro channel and tube applications are recognized as the important key technologies.…”