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Flexible organic light-emitting diodes with a high light-extraction efficiency are demonstrated using O2 plasma treatment on the back side of a PET substrate. The plasma-treated PET substrate extracts the confined waveguided electroluminescence wave in the structure, confirmed by finite-difference time-domain simulations. This leads to the enhancement of light extraction to air and thereby improvement of luminance by 70%.
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Lee et al. (2015) studied this question.
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