Researchers from South China University of Technology (SCUT) demonstrated a new MgO-based OLED encapsulation layer. The researchers say that MgO provides an efficient barrier at a low cost, and can be deposited in low temperatures.
The researchers say that this is the first time that MgO is used for OLED encapsulation, but this material has a number of advantages - a low refractive index, a wide bandgap, high dielectric constant, high chemical stability and the lack of UV irradiation treatment requirements.
The researchers managed to develop a process that deposited the MgO barrier layer-by-layer using ALD at temperatures of just 80 degrees Celsius. A test at 60 degrees and 100% humidity showed no damage to the OLED even after 600 hours.