Combined effects of microcavity and dielectric capping layer on bidirectional organic light-emitting diodes.
We report on highly enhanced and controlled light outcoupling of bidirectional organic light-emitting diodes by introduction of an enhanced microcavity structure as well as an organic capping layer (OC). Combining both OC and microcavity, we find that the overall external quantum, as well as current efficiency (CE), can be greatly enhanced. Especially, the CE with an appropriate thickness of OC is almost 1.75 times larger than that of the reference device without OC. Furthermore, we also analyze our devices with a numerical optical model calculating the flux of outcoupled photons, and compare theoretical predictions with our experimental results.
Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden, Germany. jonghee.lee@iapp.de
Jonghee
J
Lee
Simone
S
Hofmann
Mauro
M
Furno
Yong Hyun
YH
Kim
Jeong-Ik
JI
Lee
Hye Yong
HY
Chu
Björn
B
Lüssem
Karl
K
Leo