Optimal design and fabrication of ITO/organic photonic crystals in polymer light-emitting diodes using a focused ion beam

Che Hung Tsai, Lun De Liao, Yi Shiun Luo, Chang-Po Chao*, En Chen Chen, Hsin-Fei Meng, Wei Dar Chen, Shir-Kuan Lin, Chin Teng Lin

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

This study aims to achieve high directionality and large extraction of light emission from polymer light-emitting diodes via optimizing photonic crystals (PCs). The optimization is achieved through the optical modeling using a 3D finite-difference time-domain (FDTD) method and the intelligent numerical optimization technique, genetic algorithm (GA). In results, the PC period, depth and filling factor can be found. The FDTD method has been proven very effective for modeling complex multilayer PLED devices in which the electron-transporting layer is only a few tens of nanometers away from a metallic layer. On the other hand, GA is a powerful tool to cope with a complicated optimization problem with multiple variables to optimize. The optimized PCs are later fabricated by focused ion beams (FIB) for the PLED. With desired PCs, an increase of the extraction efficiency in excess of 46% is achieved experimentally and the 3D FDTD calculation explains this result faithfully.

Original languageEnglish
Pages (from-to)1331-1335
Number of pages5
JournalMicroelectronic Engineering
Volume87
Issue number5-8
DOIs
StatePublished - 1 May 2010

Keywords

  • Focused ion beam
  • Light extraction efficiency
  • Photonic crystals
  • Polymer light-emitting diodes

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