ELECTROLUMINESCENCE AND ELECTRON-TRANSPORT IN A PERYLENE DYE

Charge carrier transport in vapor-deposited films of 1,6,7,12-tetraphe noxy-N,N' propylphenyl)-perplene-3,4,9,10-bis(dicarboximide) was inves tigated using two different methods, the time-of-flight (TOF) techniqu e and time-resolved electroluminescence. Electron mobilities of 10(-5) cm(2)/V s were measured in the bulk using a time-of-flight technique. Hole transport was found to be dispersive and, thus, a transit time f or holes could not be obtained. The above dye was also used to fabrica te single layer light emitting diodes showing clearly visible red elec troluminescence under ambient conditions. Our experiments on transit e lectroluminescence confirmed the measured electron mobility and ruled out the possibility that the transit time of holes is shorter than the time range investigated in our time-of-flight experiments. (C) 1997 A merican Institute of Physics.