TITLE

Correlation between dark spot growth and pinhole size in organic light-emitting diodes

AUTHOR(S)
Lim, Shuang Fang; Ke, Lin; Wang, Wei; Chua, Soo Jin
PUB. DATE
April 2001
SOURCE
Applied Physics Letters;4/9/2001, Vol. 78 Issue 15, p2116
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Our in situ experimental observations of dark spot growth in organic light-emitting diodes using optical microscopy show a linear rate of growth for the area of all the dark spots. We used uniformly sized silica micro particles to intentionally create size-controllable pinholes on the cathode protective layer. Subsequently, we observed initial formation of dark spots as a result of these pinholes and then monitored their growth. Due to usage of particles of various diameters, we were able to linearly correlate the growth rate with pinhole size. This allows us to estimate the original pinhole sizes that gave rise to the dark spots, which we believe were initiated by "dust" particles. Our studies verify that dark spot formation is due to pinholes on the protective layer that creates pathways for water or oxygen permeation, and that dark spot growth is dependent on the pinhole sizes.
ACCESSION #
4710545

 

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