Dear Pouyan

In my experience of testing Calcium thin films, the oxygen and water are predominant factor to react with Calcium. According to literatures, Calcium can only react with nitrogen to become calcium nitride under 200 to 450 degree C. Controlling the oxygen and water levels inside the glovebox is critical to fabricate calcium present devices. When we made devices with a calcium layer involved or pure calcium layer, the degradation can start after two hours. Therefore our devices had to be encapsulated within 1 hour. The OLED devices I can kept for 5 years were still lit up. They had hardly any black spots. The most importance is to control oxygen and water levels inside the glovebox. You mentioned that you assume the glovebox is less than 1000ppm. This figure is far far too high for any calcium layer presented devices. Our glovebox was kept both oxygen and water levels less than 0.1ppm.

Hope it helps.

Best wishes

Xuhua

Hello Xuhua,

Thanks for the reply. I am digging information. In the meantime, if you happen to have any links to the sources that provide quantitative information on calcium degradation rates in various environments, that would be super appreciated.

Thanks,

Pouyan

Hello Pouyan,

This type of work is very much done in industry or research institutes linked to industrial work. That is one reason why it is difficult to find from the literatures. Sometimes you may find from international conference digests or patents.

Sorry that i couldn't do more.

Best wishes

Xuhua

That's true. It's hard to find relevant literature. I appreciate your help. Thanks.