Communication: Thin film organic electrolumiscent devices based on pol
y(2,3-diphenyl-1,4-phenylenevinylene (DP-PPV, see Fig.) have been fabr
icated using the chlorine-precursor route. Devices with the configurat
ion Mg/DP-PPV/ITO are shown to have an external quantum efficiency for
green electroluminescence of 0.1%, a value comparable to the efficien
cy of Ca/PPV devices.