Electroluminescence of a Polythiophene Molecular Wire Suspended between a Metallic Surface and the Tip of a Scanning Tunneling Microscope

Reecht, Gaël; Scheurer, F.; Speisser, Virginie; Dappe, Yannick J.; Mathevet, Fabrice; Schull, Guillaume

doi:10.1103/physrevlett.112.047403

Cited by 150 publications

(161 citation statements)

References 35 publications

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“…When a voltage is applied to the anode lead of the LED that is more positive than the voltage applied to the cathode lead by at least the forward voltage drop of the LED, a current flows and results in emitted photons with an energy equivalent to the band gap. The quantum efficiency of 10 −5 shown in panel (iii) of Figure 2b is comparable to the state of the art [2,10].…”

Section: Resultssupporting

confidence: 51%

Superluminescence from an optically pumped molecular tunneling junction by injection of plasmon induced hot electrons

Braun¹,

Wang²,

Kern³

et al. 2016

Nano Online

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Here, we demonstrate a bias-driven superluminescent point light-source based on an optically pumped molecular junction (gold substrate/self-assembled molecular monolayer/gold tip) of a scanning tunneling microscope, operating at ambient conditions and providing almost three orders of magnitude higher electron-to-photon conversion efficiency than electroluminescence induced by inelastic tunneling without optical pumping. A positive, steadily increasing bias voltage induces a step-like rise of the Stokes shifted optical signal emitted from the junction. This emission is strongly attenuated by reversing the applied bias voltage. At high bias voltage, the emission intensity depends non-linearly on the optical pump power. The enhanced emission can be modelled by rate equations taking into account hole injection from the tip (anode) into the highest occupied orbital of the closest substrate-bound molecule (lower level) and radiative recombination with an electron from above the Fermi level (upper level), hence feeding photons back by stimulated emission resonant with the gap mode. The system reflects many essential features of a superluminescent light emitting diode. 1100

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Section: Resultssupporting

confidence: 51%

Superluminescence from an optically pumped molecular tunneling junction by injection of plasmon induced hot electrons

Braun¹,

Wang²,

Kern³

et al. 2016

Nano Online

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show abstract

“…No transport measurements were reported, but the wire was used as a single molecule LED, showing electroluminescence when charges were injected from either end. 52 Both of these experiments demonstrate that homopolymer chains can be synthesized and measured in junctions. However, the scope of substrates has to be expanded to today's high performance donor−acceptor type polymers in order to garner more useful structure−property relationships from such studies.…”

Section: Relating Transport To Molecular Structurementioning

confidence: 95%

Correlating Structure and Function in Organic Electronics: From Single Molecule Transport to Singlet Fission

2015

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Advances in organic chemistry have enabled the synthesis of almost any molecule imaginable for high performance organic electronics. In this field of many possibilities, the question becomes not "what can we make" but "how do we guide the design of materials that can be made?" In this review, we address how single molecule conductance measurements can inform the rational design of organic electronics. We also survey recent developments in singlet fission and highlight areas where work can be done to make this process efficient and applicable.

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“…39,40 Here, in Figure 2a we reproduce EL spectra from the AuÀAu STM junction at ambient conditions without laser illumination. The numbers next to the spectra indicate the voltages at which the spectra were obtained.…”

Section: Resultsmentioning

confidence: 96%

Enhancement of Radiative Plasmon Decay by Hot Electron Tunneling

et al. 2015

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Here we demonstrate that photon emission induced by inelastic tunneling through a nanometer single gap between a sharp Au tip and an Au substrate can be significantly enhanced by the illumination of the junction with 634 nm laser light with an electric field component oriented parallel to the tip-axis, i.e., perpendicular to the sample. Analyzing photoluminescence (PL) spectra recorded as a function of bias voltage allows us to distinguish between PL from (1) the decay of electron-hole pairs created by the laser excited sp/d interband transition with a characteristic band at 690 nm and (2) the red-shifted radiative decay of characteristic plasmon modes formed by the gap. Since the electroluminescence spectra (without laser) already show the plasmonic gap modes, we conclude that the enhanced intensity induced by laser illumination originates from the radiative decay of hot electrons closely above the Fermi level via inelastic tunneling and photon emission into the plasmon modes. Since these processes can be independently controlled by laser illumination and the amplitude of the bias voltage, it is of great interest for designing new switchable photon emission plasmonic devices.

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Electroluminescence of a Polythiophene Molecular Wire Suspended between a Metallic Surface and the Tip of a Scanning Tunneling Microscope

Cited by 150 publications

References 35 publications

Superluminescence from an optically pumped molecular tunneling junction by injection of plasmon induced hot electrons

Superluminescence from an optically pumped molecular tunneling junction by injection of plasmon induced hot electrons

Correlating Structure and Function in Organic Electronics: From Single Molecule Transport to Singlet Fission

Enhancement of Radiative Plasmon Decay by Hot Electron Tunneling

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