ELECTRON-TRANSPORT IN A STARBURST OXADIAZOLE

In this article we report on the electron mobility of a starburst oxad iazole, 1,3,5 -[(4-tert. -butylphenyl) -2-oxadiazolyl] benzene. For di rect evidence of the electron transport capability the charge drift mo bility and its fil-ld dependence have been measured by the time-of-fli ght technique. The electron mobility showed a square root dependence o f the electric field and was somewhat larger than that for PBD. In add ition, the oxadiazole compound has been used as the electron transport layer (ETL) in light-emitting diodes (LEDs) together with poly(1,4-ph enylene vinylene). The characteristics of these devices are compared t o analogous LEDs with Alq(3) as the ETL. (C) 1997 American Institute o f Physics.