Researchers from Kyushu University discovered that lifetime of OLED displays is compromised during the evaporation production process due to small amounts of impurities in the vacuum chamber.
The researchers examined the production process and found that there are many impurities floating in the vacuum even when the deposition chamber is at room temperature. They found a strong correlation between the time the OLED is placed in the deposition chamber and its lifetime.
The researchers say that changing the process so the time spent in the chamber is shortened will result in higher lifetime displays. Many of the impurities could be traced to previously deposited materials and plasticizers from the vacuum chamber components, which means that maintaining a clean chamber is also very important.