Light Amplification by Optical Excitation of a Chemical Defect in a Conjugated Polymer


  • M. Vehse was supported by the Deutsche Forschungsgemeinschaft (project # VE-255). L. Edman acknowledges generous personal support from the Wenner-Gren foundations and a research grant from Carl Tryggers stiftelse. Research at UCSB was supported by the Air Force Office of Scientific Research (F49620-02-1-0127) and the NSF (DMR-0097611).


A small fraction of narrow-bandgap benzothiadiazole (BT) ‘defects’ covalently integrated into the main chain of a wide-bandgap polyfluorene (PF) polymer minimizes self-absorption effects via efficient energy transfer from absorbing PF segments to emitting BT ‘defects’. A threshold for amplified spontaneous emission in a glass/polymer/air optical waveguide as low as 15 kW cm–2 is achieved.