The Materials Research Science and Engineering Center at the University of Wisconsin has available on its site a highly experimental, but apparently feasible, tutorial for producing DIY OLEDs using conductive glass and a polyvinyl alcohol solution. It presents two alternatives for the application method: a 2500rpm fan or an aluminum foil + duct tape mask. Erik De Bruijn suggests using a laser cutter to create a much more detailed and accurate mask.
The first one to try it please report back :)
(via Erik De Bruijn – thanks Erik!)