Source: nanowerk.com

Organic light-emitting diodes are now entering the market place as screens for mobile phones and televisions and mass-production techniques are needed to simplify the manufacturing process and reduce costs and wastage. The electrospray-deposition technique for OLED fabrication have failed to produce polymer films that compete with other fabrication techniques. Yamagata and colleagues decided to use a combination of two solvents to improve this technique, which uses a thin glass capillary with the polymer solution stored inside and a conductive wire inserted in it. When a high voltage is
applied between this conductive wire and the OLED electrodes on the substrate, the solution sprays out of the capillary end as atomized droplets that are attracted to the substrate by electrostatic force. This means there is little solution wastage as the spray is highly directed. Yamagata also notes that: “The advantage of using electro spray deposition is that we can fabricate both smooth films and nano structured film using the same technology.” In the future he believes that this advantage “will also be useful in controlling the structure of organic semiconductor junctions for organic solar cells.”They have discovered a range of conditions using a two-solvent method that can make
extremely smooth thin films using electrospray deposition using this technology these devices could be manufactured as inexpensively as printing newspapers.Electrospray-deposited polymer films can be used to make organic light-emitting diodes with
better characteristics than those made from spin-coated films.

Source: nanowerk.com