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Infrared organic light-emitting diodes with carbon nanotube emitters

Research output: Contribution to journalArticle

Author(s)

Arko Graf, Caroline Murawski, Yuriy Zakharko, Jana Zaumseil, Malte Christian Gather

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Abstract

While organic light-emitting diodes (OLEDs) covering all colors of the visible spectrum have been demonstrated, suitable organic emitter materials in the near-infrared (nIR) beyond 800 nm are still lacking. Here, we demonstrate the first OLED based on single-walled carbon nanotubes (SWCNTs) as the emitter. By using a multi-layer stacked architecture with matching charge blocking and charge transport layers, we achieve narrow band electroluminescence at wavelengths between 1000 nm and 1200 nm, with spectral features characteristic of excitonic and trionic emission of the (6,5) SWCNTs used. We investigate the OLED performance in detail and find that local conduction hot-spots lead to pronounced trion emission. Analysis of the emissive dipole orientation shows a strong horizontal alignment of the SWCNTs with an average inclination angle of 12.9° with respect to the plane, leading to an exceptionally high outcoupling efficiency of 49 %. Our SWCNT-based OLEDs represent a highly attractive platform for emission across the entire nIR.
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Details

Original languageEnglish
Article number1706711
JournalAdvanced Materials
Volume30
Issue number12
Early online date30 Jan 2018
DOIs
Publication statusPublished - 22 Mar 2018

    Research areas

  • OLED, Single-walled carbon nanotube, Near infrared, Trion, Emitter orientation

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