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

doi:10.1021/acs.nanolett.6b02997

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

Center for Organic Photonics and Electronics Research(OPERA)

Research output: Contribution to journal › Article › peer-review

38 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 language	English
Pages (from-to)	6480-6484
Number of pages	5
Journal	Nano Letters
Volume	16
Issue number	10
DOIs	https://doi.org/10.1021/acs.nanolett.6b02997
Publication status	Published - Oct 12 2016

All Science Journal Classification (ASJC) codes

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

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10.1021/acs.nanolett.6b02997

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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.",

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AU - Chong, Michael C.

AU - Sosa-Vargas, Lydia

AU - Bulou, Hervé

AU - Boeglin, Alex

AU - Scheurer, Fabrice

AU - Mathevet, Fabrice

AU - Schull, Guillaume

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AB - 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.

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

Abstract

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