Journal ArticleDOI
Expanded Theory of H- and J-Molecular Aggregates: The Effects of Vibronic Coupling and Intermolecular Charge Transfer.
TLDR
This review outlines advances made in understanding the relationship between aggregate structure and photophysics when vibronic coupling and intermolecular charge transfer are incorporated.Abstract:
The electronic excited states of molecular aggregates and their photophysical signatures have long fascinated spectroscopists and theoreticians alike since the advent of Frenkel exciton theory almost 90 years ago. The influence of molecular packing on basic optical probes like absorption and photoluminescence was originally worked out by Kasha for aggregates dominated by Coulombic intermolecular interactions, eventually leading to the classification of J- and H-aggregates. This review outlines advances made in understanding the relationship between aggregate structure and photophysics when vibronic coupling and intermolecular charge transfer are incorporated. An assortment of packing geometries is considered from the humble molecular dimer to more exotic structures including linear and bent aggregates, two-dimensional herringbone and “HJ” aggregates, and chiral aggregates. The interplay between long-range Coulomb coupling and short-range charge-transfer-mediated coupling strongly depends on the aggregate ...read more
Citations
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Equation-of-Motion Methods for the Calculation of Femtosecond Time-Resolved 4-Wave-Mixing and N-Wave-Mixing Signals.
TL;DR: The nonlinear response function (NRF) approach and the spectroscopic equation-of-motion (EOM) approach are two alternative theoretical formalisms for the calculation of spectroscopy signals as discussed by the authors .
Journal ArticleDOI
Understanding Bipolarons in Conjugated Polymers Using a Multiparticle Holstein Approach
Journal ArticleDOI
Reexamining the Heavy-Atom-Effect: The Universal Heavy-Atom-Induced Fluorescence Enhancement Principle for Through-Space Conjugated AIEgens
Zuping Xiong,Wenqi Gong,Pengfei Xu,Mengyi Jiang,Xuting Cai,Yuqing Zhu,Xinni Ping,Hui Feng,Huili Ma,Zhaosheng Qian +9 more
TL;DR: In this article , a series of tetraphenylethylene (TPE)-based AIEgens containing diverse non-metallic elements were designed by introducing each nonmetallic element into the typical TPE skeleton, and their abnormal heavy-atom-induced fluorescence enhancement behaviors were examined against the classic heavy atom effect.
Journal ArticleDOI
Highly efficient photocatalytic hydrogen evolution based on conjugated molecular micro/nano-crystalline sheets
TL;DR: In this article, a conjugated organic molecule was constructed from an electron-donating unit (electrondonating benzo[1,2-b:5,4-b′]dithiophene) and electron-withdrawing groups (cyano and pyridine) and fabricated into sheet-shaped crystals.
Journal ArticleDOI
Conversion between triplet pair states is controlled by molecular coupling in pentadithiophene thin films.
Natalie A. Pace,Brandon K. Rugg,Christopher Chang,Obadiah G. Reid,Obadiah G. Reid,Karl J. Thorley,Sean Parkin,John E. Anthony,Justin C. Johnson +8 more
TL;DR: The connection between population evolution using electronic and spin spectroscopies enables assignments that provide a more detailed picture of triplet pair evolution than previously presented and provides critical guidance for designing molecular QIS systems based on light-induced spin coherence.
References
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Journal ArticleDOI
Detailed Balance Limit of Efficiency of p‐n Junction Solar Cells
TL;DR: In this article, an upper theoretical limit for the efficiency of p−n junction solar energy converters, called the detailed balance limit of efficiency, has been calculated for an ideal case in which the only recombination mechanism of holeelectron pairs is radiative as required by the principle of detailed balance.
Journal ArticleDOI
Coherence in Spontaneous Radiation Processes
TL;DR: In this article, the authors considered a radiating gas as a single quantum-mechanical system, and the energy levels corresponding to certain correlations between individual molecules were described, where spontaneous emission of radiation in a transition between two such levels leads to the emission of coherent radiation.
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Organic Thin Film Transistors for Large Area Electronics
TL;DR: In this article, the authors present new insight into conduction mechanisms and performance characteristics, as well as opportunities for modeling properties of organic thin-film transistors (OTFTs) and discuss progress in the growing field of n-type OTFTs.
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Charge transport in organic semiconductors.
Veaceslav Coropceanu,Jérôme Cornil,Demetrio A. da Silva Filho,Yoann Olivier,Robert J. Silbey,Jean-Luc Brédas +5 more
TL;DR: Electronic Coupling in Oligoacene Derivatives: Factors Influencing Charge Mobility, and the Energy-Splitting-in-Dimer Method 3.1.