Photocurrent in an electron transporting luminescent polymer

Photocurrent measurements have been carried out on thin films of poly(2,5-pyridinediyl), a promising polymer for applications in light-emitting diodes. The spectral dependence of the photocurrent has been recorded using the four possible directions of the applied electric field and illumination, and clear symbatic and antibatic behavior was observed. A strong, symmetric photocurrent increase with bias has been found, while the temperature dependence is relatively weak. The analysis of the results provides evidence that electrons are the majority charge carriers and gives insight into the carrier-transport mechanism in poly(2,5-pyridinediyl). (C) 2000 American Institute of Physics. [S0003-6951(00)00206-0].