Alq(3)/PVK heterojunction electroluminescent devices

We report on the design, manufacturing and testing of Alq(3)/polyvinylcarba zole (PVK) light emitting devices. The devices were obtained by spin coatin g PVK films on indium tin oxide coated glass substrates. Alq(3) films were then deposited by high vacuum thermal evaporation. The devices were topped by depositing magnesium/silver electrodes by thermal evaporation. After dep osition, the samples were stored and operated under a nitrogen atmosphere i n order to prevent damage due to oxidation. The thickness of the active lay ers was purposely chosen to be large in order to study the device with an e lectro-optic reflectometric technique. (C) 2000 Elsevier Science S.A. All r ights reserved.