Air Stability of Cs₂CO₃:Ag/Ag Cathode for Organic Light-Emitting Diodes

We report the superior stability of the composite Cs₂CO₃:Ag/Ag cathode structure, which can be used in efficient organic light-emitting diodes (OLEDs). Devices with the Cs₂CO₃:Ag (1:10, 5nm)/Ag (95nm) cathode show a considerably improved lifetime compared with the control device with the Cs₂CO₃ (0.5nm)/Ag (100nm) cathode. The composite Cs₂CO₃:Ag/Ag film is proved to be stable in the atmosphere. X-ray diffraction (XRD) is applied to analyze the crystalline structure of the Cs₂CO₃:Ag film, and it is demonstrated that CsAg alloy is formed, leading to the improved stability of the thin film and the devices.