Journal ArticleDOI
The Structure and Dynamics of Molecular Excitons
TLDR
This review categorizes the three different exciton types typically encountered in organic semiconductors (Frenkel singlet, Frenkel triplet, and charge transfer) and considers the problem of a localized exciton diffusing in a disordered matrix in detail.Abstract:
The photophysical behavior of organic semiconductors is governed by their excitonic states. In this review, I classify the three different exciton types (Frenkel singlet, Frenkel triplet, and charge transfer) typically encountered in organic semiconductors. Experimental challenges that arise in the study of solid-state organic systems are discussed. The steady-state spectroscopy of intermolecular delocalized Frenkel excitons is described, using crystalline tetracene as an example. I consider the problem of a localized exciton diffusing in a disordered matrix in detail, and experimental results on conjugated polymers and model systems suggest that energetic disorder leads to subdiffusive motion. Multiexciton processes such as singlet fission and triplet fusion are described, emphasizing the role of spin state coherence and magnetic fields in studying singlet ↔ triplet pair interconversion. Singlet fission provides an example of how all three types of excitons (triplet, singlet, and charge transfer) may interact to produce useful phenomena for applications such as solar energy conversion.read more
Citations
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Journal ArticleDOI
Organic Optoelectronic Materials: Mechanisms and Applications
TL;DR: The article reviews the current understanding of the physical mechanisms that determine the (opto)electronic properties of high-performance organic materials and highlights the capabilities of various experimental techniques for characterization, summarizes top-of-the-line device performance, and outlines recent trends in the further development of the field.
Journal ArticleDOI
Expanded Theory of H- and J-Molecular Aggregates: The Effects of Vibronic Coupling and Intermolecular Charge Transfer.
TL;DR: This review outlines advances made in understanding the relationship between aggregate structure and photophysics when vibronic coupling and intermolecular charge transfer are incorporated.
Journal ArticleDOI
Light Absorption and Energy Transfer in the Antenna Complexes of Photosynthetic Organisms.
Tihana Mirkovic,Evgeny E. Ostroumov,Jessica M. Anna,Rienk van Grondelle,Govindjee,Gregory D. Scholes,Gregory D. Scholes +6 more
TL;DR: The description of energy transfer, in particular multichromophoric antenna structures, is shown to vary depending on the spatial and energetic landscape, which dictates the relative coupling strength between constituent pigment molecules.
Journal ArticleDOI
Exciton diffusion in organic semiconductors
TL;DR: In this paper, the authors provide a basic physical description of the exciton diffusion in organic semiconductors and present experimental methods that are used to measure the key parameters of this process.
Journal ArticleDOI
Molecular Aggregate Photophysics beyond the Kasha Model: Novel Design Principles for Organic Materials
TL;DR: Interference between the short- and long-range (Coulomb) couplings gives rise to a host of new aggregate types, referred to as HH, HJ, JH, and JJ aggregates, with distinct photophysical properties, which can be exploited for electronic materials design.
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
Zwischenmolekulare Energiewanderung und Fluoreszenz
TL;DR: In this article, a quantenmechanische behandlung des Ubergangs von Elektronenanregungsenergie zwischen gleichartigen Molekulen in Losung gegeben.
Journal ArticleDOI
Highly efficient phosphorescent emission from organic electroluminescent devices
Marc A. Baldo,D. F. O’Brien,Yujian You,Andrei Shoustikov,Scott Sibley,Scott Sibley,Mark E. Thompson,Stephen R. Forrest +7 more
TL;DR: In this article, a host material doped with the phosphorescent dye PtOEP (PtOEP II) was used to achieve high energy transfer from both singlet and triplet states.
Journal ArticleDOI
The exciton model in molecular spectroscopy
TL;DR: In this paper, a summary of the various type cases for molecular dimers, trimers and double and triple molecules in the description of the molecular exciton strong-coupling model is presented.
Journal ArticleDOI
Evidence for wavelike energy transfer through quantum coherence in photosynthetic systems
Gregory S. Engel,Gregory S. Engel,Tessa R. Calhoun,Tessa R. Calhoun,Elizabeth L. Read,Elizabeth L. Read,Tae Kyu Ahn,Tae Kyu Ahn,Tomáš Mančal,Tomáš Mančal,Tomáš Mančal,Yuan-Chung Cheng,Yuan-Chung Cheng,Robert E. Blankenship,Graham R. Fleming,Graham R. Fleming +15 more
TL;DR: Previous two-dimensional electronic spectroscopy investigations of the FMO bacteriochlorophyll complex are extended, and direct evidence is obtained for remarkably long-lived electronic quantum coherence playing an important part in energy transfer processes within this system is obtained.