Abstract
To outcouple the photons trapped in OLEDs, the effect
of a rough ITO surface is investigated. The rough surface is obtained by simple
maskless wet etching producing a randomly distributed nano-pattern. The power
efficiency is improved by 54%, and further enhanced to 83% with a microlens
array. As the pattern located between the organic layer and the ITO anode
overlaps strongly with the guided mode, it results in a strong scattering
rather than the diffraction, so that the device produces no angular dependence
or spectral shift. Electrical property and the lifetime of the device are
not affected by the etched ITO.
© 2013 IEEE
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