Efficient solid-state photon upconversion enabled by triplet formation at an organic semiconductor interface

2021 ◽  
Author(s):  
Seiichiro Izawa ◽  
Masahiro Hiramoto
Keyword(s):  
Solid State ◽  
Organic Semiconductor ◽  
Semiconductor Interface ◽  
Triplet Formation

scholarly journals Efficient Solid-State Photon Upconversion Enabled by Spin Inversion at Organic Semiconductor Interface

2021 ◽  
Author(s):  
Seiichiro Izawa ◽  
Masahiro Hiramoto
Keyword(s):  
Solid State ◽  
Organic Semiconductor ◽  
Charge Separation ◽  
Near Infrared ◽  
Semiconductor Interface ◽  
Problematic Issue ◽  
Light Excitation ◽  
Conventional Systems ◽  
Triplet Formation ◽  
Spin Inversion

We realized solid-state UC with 100 times higher efficiency than a conventional system by discovering a novel UC mechanism in bilayer organic semiconductor heterojunctions. The UC occurred through spin inversion during the charge separation and recombination at the interface. The key to the success was the triplet formation at the interface, as this could avoid the loss process during triplet diffusion, which is a problematic issue in conventional systems. As a result of this finding, efficient UC from near-infrared to visible light on flexible thin films under LED light excitation was made possible.

scholarly journals Efficient Solid-State Photon Upconversion Enabled by Spin Inversion at Organic Semiconductor Interface

2021 ◽  
Author(s):  
Seiichiro Izawa ◽  
Masahiro Hiramoto
Keyword(s):  
Solid State ◽  
Organic Semiconductor ◽  
Charge Separation ◽  
Near Infrared ◽  
Semiconductor Interface ◽  
Problematic Issue ◽  
Light Excitation ◽  
Conventional Systems ◽  
Triplet Formation ◽  
Spin Inversion

We realized solid-state UC with 100 times higher efficiency than a conventional system by discovering a novel UC mechanism in bilayer organic semiconductor heterojunctions. The UC occurred through spin inversion during the charge separation and recombination at the interface. The key to the success was the triplet formation at the interface, as this could avoid the loss process during triplet diffusion, which is a problematic issue in conventional systems. As a result of this finding, efficient UC from near-infrared to visible light on flexible thin films under LED light excitation was made possible.

scholarly journals Direct Observation of Entropy-Driven Electron-Hole Pair Separation at an Organic Semiconductor Interface

2015 ◽  
Vol 114 (24) ◽  
Author(s):  
Nicholas R. Monahan ◽  
Kristopher W. Williams ◽  
Bharat Kumar ◽  
Colin Nuckolls ◽  
X.-Y. Zhu
Keyword(s):  
Direct Observation ◽  
Organic Semiconductor ◽  
Hole Pair ◽  
Electron Hole ◽  
Semiconductor Interface ◽  
Pair Separation ◽  
Electron Hole Pair

scholarly journals Very compact tunable solid-state laser utilizing a thin-film organic semiconductor

2001 ◽  
Vol 26 (9) ◽  
pp. 593 ◽  
Author(s):  
S. Riechel ◽  
U. Lemmer ◽  
J. Feldmann ◽  
S. Berleb ◽  
A. G. Mückl ◽  
...  
Keyword(s):  
Thin Film ◽  
Solid State ◽  
Organic Semiconductor ◽  
Solid State Laser ◽  
State Laser

Minute Torsional Reorganization Elicited Large Visible Range Fluorescence Gain in Terphenyl Derived Crystals

2022 ◽  
Author(s):  
Tapan Ghosh ◽  
Madalasa Mondal ◽  
Ratheesh Vijayaraghavan
Keyword(s):  
Solid State ◽  
Intermolecular Interactions ◽  
Organic Semiconductor ◽  
Structural Rearrangement ◽  
Semiconductor Materials ◽  
Visible Range ◽  
Optical Signals ◽  
Electro Optic ◽  
Organic Semiconductor Materials

Understanding the variations in the solid-state optical signals of organic semiconductor materials upon subtle structural rearrangement or intermolecular interactions would help to extract the best performance in their electro-optic devices....

Impact of surface states and bulk doping level on hybrid inorganic/organic semiconductor interface energy levels

2018 ◽  
Vol 123 (24) ◽  
pp. 245501 ◽  
Author(s):  
T. Schultz ◽  
J. Niederhausen ◽  
R. Schlesinger ◽  
S. Sadofev ◽  
N. Koch
Keyword(s):  
Organic Semiconductor ◽  
Doping Level ◽  
Energy Levels ◽  
Surface States ◽  
Interface Energy ◽  
Semiconductor Interface

Interfacial Energy Level Alignment at Acid Oxidized Carbon Nanotube - Triphenyldiamine Contacts

2010 ◽  
Vol 1258 ◽  
Author(s):  
Li Wei Tan ◽  
Ross A. Hatton ◽  
Cristina E. Giusca ◽  
Ravi Silva
Keyword(s):  
Carbon Nanotube ◽  
Organic Semiconductor ◽  
Photoelectron Spectroscopy ◽  
Time Frame ◽  
Spectroscopy Study ◽  
Semiconductor Interface ◽  
Dipole Layer ◽  
Oxidized Carbon ◽  
The Difference ◽  
Electrical Equilibrium

AbstractWe report an ultraviolet photoelectron spectroscopy study of the energetics at the interface between acid oxidised carbon nanotubes and the archetypical molecular N,N'-diphenyl-N,N'-bis(3-methylphenyl)-1,1'biphenyl-4,4'diamine(TPD). Electrical equilibrium is achieved across both interfaces within the experiment time frame due to the formation of an interfacial dipole layer which abruptly shifts the vacuum level at the interface. To the authors knowledge this is the first reported measurement of the electronic structure of a carbon nanotube / organic semiconductor interface; a system in which the magnitude of the dipole layer formed at the interface upon contact formation is proportional to the difference in work function between the substrate and organic semiconductor overlayer.

scholarly journals Electro-optical interfacial effects on a graphene/π-conjugated organic semiconductor hybrid system

2018 ◽  
Vol 9 ◽  
pp. 963-974 ◽  
Author(s):  
Karolline A S Araujo ◽  
Luiz A Cury ◽  
Matheus J S Matos ◽  
Thales F D Fernandes ◽  
Luiz G Cançado ◽  
...  
Keyword(s):  
Hybrid System ◽  
Organic Semiconductor ◽  
Optical Emission ◽  
Optical Excitation ◽  
Kelvin Probe ◽  
Self Assembled Monolayer ◽  
Semiconductor Interface ◽  
Probe Microscopy ◽  
Kelvin Probe Microscopy ◽  
Force Microscopy

The influence of graphene and retinoic acid (RA) – a π-conjugated organic semiconductor – interface on their hybrid system is investigated. The physical properties of the interface are assessed via scanning probe microscopy, optical spectroscopy (photoluminescence and Raman) and ab initio calculations. The graphene/RA interaction induces the formation of a well-organized π-conjugated self-assembled monolayer (SAM) at the interface. Such structural organization leads to the high optical emission efficiency of the RA SAM, even at room temperature. Additionally, photo-assisted electrical force microscopy, photo-assisted scanning Kelvin probe microscopy and Raman spectroscopy indicate a RA-induced graphene doping and photo-charge generation. Finally, the optical excitation of the RA monolayer generates surface potential changes on the hybrid system. In summary, interface-induced organized structures atop 2D materials may have an important impact on both design and operation of π-conjugated nanomaterial-based hybrid systems.

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