Abstract
We fabricated 2-stack white organic light-emitting diode (WOLED) structure
with luminance efficiency of 27.4 cd/A and color point of (0.32, 0.29) where
one unit device emitted blue color and the other emitted red and green
colors. Comparing with other configurations possible for 2-stack WOLED, it
was found that our structure had merits of higher color gamut and lower
power consumption, in spite of low luminance efficiency. In our 2-stack
structure, we found that the blue efficiency which determines the power
consumption of panel was strongly dependent on the position of the blue
emitting layer. Based on an optical simulation and a viewing-angle analysis,
we proved that the change of the luminance of blue color came from the
microcavity effect depending on the distances between anode and cathode and
between blue emitting layer and cathode.
© 2009 IEEE
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