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Download fileOrdinary and Hot Electroluminescence from Single-Molecule Devices: Controlling the Emission Color by Chemical Engineering
journal contribution
posted on 2016-09-21, 00:00 authored by Michael C. Chong, Lydia Sosa-Vargas, Hervé Bulou, Alex Boeglin, Fabrice Scheurer, Fabrice Mathevet, Guillaume SchullSingle-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 unita molecular chromophoresuspended
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.
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spectroscopic fingerprintTunneling electronsEmission Colorblue-shifted onesred-shifted featuresHot Electroluminescencechemical structureblue-shifted vibronic featureslight-emitting devicescryogenic scanning tunneling microscopeSingle-Molecule Devicesnarrow-line emissionemission lineChemical Engineering Single-molecule junctions