Ordinary and Hot Electroluminescence from Single-Molecule Devices: Controlling the Emission Color by Chemical Engineering

Michael C. Chong, Lydia Sosa-Vargas, Hervé Bulou, Alex Boeglin, Fabrice Scheurer, Fabrice Mathevet, Guillaume Schull

    Research output: Contribution to journalArticlepeer-review

    25 Citations (Scopus)

    Abstract

    Single-molecule junctions specifically designed for their optical properties are operated as light-emitting devices using a cryogenic scanning tunneling microscope. They are composed of an emitting unit - a molecular chromophore - suspended between a Au(111) surface and the tip of the microscope by organic linkers. Tunneling electrons flowing through these junctions generate a narrow-line emission of light whose color is controlled by carefully selecting the chemical structure of the emitting unit. Besides the main emission line, red and blue-shifted vibronic features of low intensity are also detected. While the red-shifted features provide a spectroscopic fingerprint of the emitting unit, the blue-shifted ones are interpreted in terms of hot luminescence from vibrationally excited states of the molecule.

    Original languageEnglish
    Pages (from-to)6480-6484
    Number of pages5
    JournalNano Letters
    Volume16
    Issue number10
    DOIs
    Publication statusPublished - Oct 12 2016

    All Science Journal Classification (ASJC) codes

    • Bioengineering
    • Chemistry(all)
    • Materials Science(all)
    • Condensed Matter Physics
    • Mechanical Engineering

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