Spectral-distortion-free light extraction from organic light-emitting diodes using nanoscale photonic crystal

Yong Sub Shim, Kyu Nyun Kim, Ju Hyun Hwang, Cheol Hwee Park, Sun Gyu Jung, Young Wook Park, Byeong Kwon Ju

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Despite their generally good performance, photonic crystal (PC)-based organic light-emitting diodes (OLEDs) encounter a serious spectral distortion problem. In this study, we obtained spectral-distortion-free PC-based OLEDs by lowering the pitch (period of the PC) to less than a half the emission wavelength, using a simple and scalable nanoscale process of laser interference lithography. The demonstrated OLEDs with 200 nm pitch-size nanoscale periodic hole arrays exhibited negligible changes in the Internal Commission on Illumination 1931 color coordinate of Δ (0.0104, 0.0078) and a peak wavelength of Δ0 nm (relative to the reference), while maintaining the function of the internal light extraction layer, manifested as a 23% enhancement of the external quantum efficiency (EQE). The enhancement of the EQE reached 85% after incorporating a micro-lens array. The improved light extraction, spectral-distortion-free characteristic, and excellent color stability over a broad range of viewing angles were successfully derived by performing finite difference time domain simulations.

Original languageEnglish
Article number045301
JournalNanotechnology
Volume28
Issue number4
DOIs
Publication statusPublished - 2017 Jan 27

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ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Electrical and Electronic Engineering

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