Polymer electroluminescent diodes with microcylindrical geometry

Cylindrical microcavity structures, such as microrings and microdisks of pi -conjugated conducting polymers were fabricated for an optically pumped las er and a light, emitting diode (LED). Extremely low excitation threshold fo r lasing has been demonstrated with the microring or microdisk structure. M icro-LEDs with cylindrical geometry of Al/pi-conjugated conducting polymers /ITO have been fabricated and the electroluminescence has been observed upo n application of an electric field. These results suggest the future possib ility of electrically pumped conducting polymer laser diodes.