TITLE

Degradation and failure of organic light-emitting devices

AUTHOR(S)
Ke, Lin; Chua, Soo-Jin; Zhang, Keran; Yakovlev, Nikolai
PUB. DATE
March 2002
SOURCE
Applied Physics Letters;3/25/2002, Vol. 80 Issue 12, p2195
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The degradation and failure of organic light-emitting device are observed via optical microscopy. The "degraded area" has been identified to be made up of three regions: (1) a dark spot at the center, (2) a nonemitting area forming the core, and (3) a weakly emitting area surrounding the core. It is found that due to metal migration, as evidenced from the secondary ion mass spectrometry profiles, the indium tin oxide/polymer interface roughens during operation. The intense local current at sharp points degrades the polymer causing the formation of the dark center. Further current stress caused the central core to carbonize which may lead to short and/or open circuits accompanied by fluctuations in the device current.
ACCESSION #
6358304

 

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