We report the properties of MEH-PPV/onium salt blends which we find to be d
oped by a photoinduced electron-transfer reaction on photoabsorption in the
MEH-PPV. The quantum efficiency of this process is determined as a functio
n of the incident photon energy, and compared with the corresponding photoc
urrent quantum efficiency. This system can be used to measure a cumulative
dose of visible or high-energy radiation.