Enhanced out-coupling efficiency of organic light-emitting diodes using an nanostructure imprinted by an alumina nanohole array

Kuniaki Endo, Chihaya Adachi

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

We demonstrate organic light-emitting diodes (OLEDs) with enhanced out-coupling efficiency containing nanostructures imprinted by an alumina nanohole array template that can be applied to large-emitting-area and flexible devices using a roll-to-roll process. The nanostructures are imprinted on a glass substrate by an ultraviolet nanoimprint process using an alumina nanohole array mold and then an OLED is fabricated on the nanostructures. The enhancement of out-coupling efficiency is proportional to the root-mean-square roughness of the nanostructures, and a maximum improvement of external electroluminescence quantum efficiency of 17% is achieved. The electroluminescence spectra of the OLEDs indicate that this improvement is caused by enhancement of the out-coupling of surface plasmon polaritons.

Original languageEnglish
Article number121102
JournalApplied Physics Letters
Volume104
Issue number12
DOIs
Publication statusPublished - Mar 24 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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