Abstract
Since polymer light-emitting diodes can be fabricated by a solution process, these devices are attractive due to the low fabrication cost and the large emitting area. Though a multilayer structure is necessary to improve device performances, it is difficult to fabricate by a solution process. We investigated another deposition process, called as an electrospray deposition. In this method, a high voltage of approximately several kV is applied to a nozzle, from which the polymer solution is sprayed, and the organic solvent is evaporated before reaching the substrate. As a result, multilayer organic films can be deposited without dissolving the under layer. In this report, we investigated a single layer structure of polyfluorene-based polymers. The photoluminescence spectrum and the surface roughness were investigated by changing the applied voltage.
