@article{CTT100562417,
  author = {S. M. Jeong and F. Araoka and Y. Machida and K. Ishikawa and H. Takezoe},
  title = {Enhancement of normally-directed light outcoupling from organic light-emitting diodes using nano-imprinted low-refractive-index layer},
  journal = {Appl. Phys. Lett.},
  year = 2008,
}

@article{CTT100584222,
  author = {S. M. Jeong and F. Araoka and Y. Machida and Y. Takanishi and K. Ishikawa and H. Takezoe},
  title = {Enhancement of Light Extraction from Organic Light-Emitting Diodes with Two-Dimensional Hexagonally Nano-Imprinted Periodic Structures Using Sequential Surface Relief Grating},
  journal = {Jpn. J. Appl. Phys.},
  year = 2008,
}