Close-Spaced Sublimation of Organic Materials for Organic Light-Emitting Devices

摘要

We have demonstrated organic light-emitting devices (OLEDs) fabricated by using a close-spaced sublimation (CSS) method. We have deposited tris(8-hydroxyquinolinato)aluminum (Alq(3)) layer using a CSS process for the formation of electron transport layer of the PVK/Alq(3) bilayer OLEDs. The distance between the sublimation source and substrate was fixed to be less than 5mm. The substrate temperature was maintained less than 70 degrees C while the sublimation source temperature was varied from 185 to 200 degrees C during the deposition of Alq(3) film. We investigated the photoluminescence characteristic of the CSS processed Alq(3) film. We also investigated the emission and electro-optical properties of the PVK/Alq(3) bilayer OLEDs with CSS deposited Alq(3) film.