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Outcoupling efficiency (OCE) of organic light emitting diodes (OLEDs) with four different microlens arrays was studied by two-dimensional finite-difference time-domain simulation to find out correlation between the size of microlenses and OCE. The OCE decreased as the size of microlenses was reduced irrespective of the shape of microlenses. Especially, the OCE became similar to that of basic OLED...
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