P‐90: Permeation Properties of Inorganic Thin‐Film and Its Application to PM‐OLED using Electron Beam Evaporation System

Abstract

AbstractIn this paper, the inorganic thin‐film passivation layer was proposed to protect the passive matrix organic light diodes (PMOLEDs) with the cathode separator from moisture and oxygen. Passivation film is deposited by electron beam evaporation. There is important thing not to damage on organic layer and to select suitable passivation materials. So, the various kinds of inorganic matrials were deposited onto the poly(carbonate) film and water vapor transmission rates (WVTRs) of these films were measured. As a result of WVTRs, the MgO thin‐film had lower WVTR value than any other inorganic thin‐films. In this investigation, we analyzed the properties of the current‐voltage and luminescence characteristics for both MgO‐passivated OLED and nonpassivated OLED. MgO‐passivated OLED were remarkable improved the lifetime compare to non‐passivated OLED. Therefore, we can consider that the MgO thin‐film passivation mathod is one of the most suitable candidates for the thin‐film passivation layer for OLED.