We report on light emitting diodes (LEDs) using a green emission polymer system developed by Dow Chemical. The LEDs were tested with both AC and DC drive schemes. Optimised devices have a CW brightness in excess of 25,000 cd/m(2) and a peak pulsed brightness exceeding 2,000,000 cd/m(2). We describe the fabrication and processing steps required to reach this performance and highlight prospects for further development. (C) 2000 Elsevier Science S.A. All rights reserved.