Patternable Semi‐Transparent Cathode using Thermal Evaporation for OLED Display Applications

Abstract A new patternable semi‐transparent metal cathode, Zn:Mg (4:1 and 10:1) using the thermal evaporation process for organic light‐emitting diode (OLED) display applications is reported. A new Zn:Mg alloy film shows good surface morphology and almost no temperature effect on the shadow mask. The Zn:Mg layer with ratio of 4:1 and 10:1 shows sheet resistance of 33.2 and 39.2 Ω ϒ −1 , respectively, at the thickness of 12 nm. The fabricated green top‐emitting OLED (TEOLED) with Zn:Mg cathode shows current efficiency of 79.3 cd A −1 and a color coordinates of (0.166, 0.755). These results show the possibility of high‐quality cathode patterning for various OLED display and sensor applications.