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
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Design, synthesis, and applications of pyrene-quinoline based cell-permeable AIEgen for cellular imaging and antibacterial activity
TL;DR: In this paper , a pyrene-quinoline based cell-permeable aggregation-induced emission luminogen (AIEgen) with implications in cellular imaging and antibacterial activity was described.
Journal ArticleDOI
Comparison of Frenkel and Excimer Exciton Diffusion in Perylene Bisimide Nanoparticles.
TL;DR: In this article , the authors compare the mobility of singlet and excimer excitons in nanoparticles consisting of the same type of perylene bisimide molecules and reveal that the excimer mobility can be higher than the singlet mobility and is affected by the intermolecular electronic coupling.
Journal ArticleDOI
Geometry design of tethered small-molecule acceptor enables highly stable and efficient polymer solar cells
Yang Bai,Ze Zhang,Hua Geng,Qi Chen,Seoyoung Kim,Rui Zhang,Cen Zhang,Bowen Chang,Shangyu Li,Hong-bin Fu,Lingwei Xue,Haiqiao Wang,Wei Chen,Mengyuan Gao,Long Ye,Yuanyuan Zhou,Yanni Ouyang,Chunfeng Zhang,Feng Gao,Changduk Yang,Yongfang Li,Zhi-Guo Zhang +21 more
TL;DR: In this article , the thiophene-dicarboxylate spacer tethered small-molecule acceptors are designed, and their molecular geometries are further regulated via the Thiophene core isomerism engineering, affording dimeric TDY-α with a 2, 5-substitution on the core.
Journal ArticleDOI
Influence of Excited-State Delocalization on Singlet Fission: Tuning Triplet-Pair-State Emission in Thin Films
Julian Hausch,Nico Hofeditz,Jona Bredehöft,Sebastian Hammer,Jens Pflaum,Katharina Broch,Marina Gerhard,Frank Schreiber +7 more
TL;DR: In this paper , the authors show that triplet-pair state luminescence correlates with higher excited-state delocalization, possibly due to the impact of structural disorder on exciton localization.
References
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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.
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Organic Thin Film Transistors for Large Area Electronics
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Journal ArticleDOI
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