Influence of vacuum chamber impurities on the lifetime of organic light-emitting diodes.

ABSTRACT: We evaluated the influence of impurities in the vacuum chamber used for the fabrication of organic light-emitting diodes on the lifetime of the fabricated devices and found a correlation between lifetime and the device fabrication time. The contact angle of the ITO substrates stored the chamber under vacuum were used to evaluate chamber cleanliness. Liquid chromatography-mass spectrometry was performed on Si wafers stored in the vacuum chamber before device fabrication to examine the impurities in the chamber. Surprisingly, despite the chamber and evaporation sources being at room temperature, a variety of materials were detected, including previously deposited materials and plasticizers from the vacuum chamber components. We show that the impurities, and not differences in water content,

SUBMITTER: Fujimoto H 

PROVIDER: S-EPMC5153845 | biostudies-literature | 2016 Dec

REPOSITORIES: biostudies-literature