Lifetime test of organic light-emitting device in high vacuum and usual package

This article introduces two experiments: one is the lifetime test of organic light-emitting device(OLED) packaged by UV cured epoxy resin in a high vacuum environment after being unpackaged, the other is the lifetime test of unpackaged OLED in atmospheric condition using the same parameters. The results of experiments show that the accelerating lifetime of unpackaged OLED in a high vacuum environment is 1675 h while that of packaged OLED in atmospheric condition is 1224 h, which indicates that the lifetime of OLED in a high vacuum environment has an obvious improvement. This phenomenon proves that the penetration of water vapor and oxygen through materials packaged by UV cured epoxy resin are significant factors influencing the lifetime of OLED packaged by UV cured epoxy resin. Inspiratory films in OLEDs cannot totally absorb water vapor and oxygen penetrating into the devices. Besides water vapor and oxygen, there are some other important factors influencing the lifetime of OLEDs.