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Keywords:

  • surface plasmonic loss;
  • intrinsic absorption loss;
  • transparent organic light-emitting diodes;
  • high refractive index microstructure
Thumbnail image of graphical abstract

The front cover image shows the effect of extracting the light trapped inside of organic lightemitting diodes (OLED) by using structures on both sides. On page 3571, Jang-Joo Kim and co-workers report extremely high light out-coupling efficiency from a transparent organic light-emitting diode integrated with microstructures on both sides of the device. It is also shown that the metal free device offers dramatically reduced surface plasmonic losses.