Enhanced Reverse Intersystem Crossing Promoted by Triplet Exciton–Photon Coupling

2021 ◽  
Author(s):  
Qi Ou ◽  
Yihan Shao ◽  
Zhigang Shuai
Keyword(s):  
Triplet Exciton ◽  
Intersystem Crossing ◽  
Photon Coupling

Über die Photoleitung flüssiger Aromaten bei Anregung des Triplett-Zustandes

1966 ◽  
Vol 21 (4) ◽  
pp. 441-446
Author(s):  
H. Bässler ◽  
B. Dries
Keyword(s):  
Absorption Band ◽  
Light Intensity ◽  
Aromatic Compounds ◽  
Liquid State ◽  
Response Curve ◽  
Spectral Response ◽  
Dark Conductivity ◽  
Triplet Exciton ◽  
Intersystem Crossing ◽  
Absorption Region

Irradiation of the aromatic compounds Benzene, Naphthalene, Biphenyl, Pyrene, and Benzophenone in the liquid state with a Xenon-arc-lamp produces a photocurrent, if an external d. c. voltage is applied. This current is independent of the dark-conductivity and increases linearily with light-intensity. It does not appear, if blocking quartz electrodes are used. The spectral response curve shows one peak at the wavelength of the forbidden singlet-triplet absorption-band of the compound and another at the longwave-edge of the singlet-absorption-region. A model is proposed basing on the idea of triplet-exciton formation (T1) by direct S0—T1 transitions and by transitions from S1 to T1 states (intersystem-crossing). The triplet exciton can migrate to the electrodes and dissociate there for energetic reasons. The released electron is received by the electrode. The cation remains either in the liquid or recombines with the electron. The cation can contribute to the photocurrent only when the dissociation has happened at the anode. In agreement with the measurements, dissociation requires conducting electrodes and follows monomolecular kinetics.

Nuclear relaxation in one-dimensional triplet-exciton systems

1982 ◽  
Vol 43 (4) ◽  
pp. 663-673 ◽  
Author(s):  
J.P. Travers ◽  
M. Gugliehni ◽  
M. Nechtschein
Keyword(s):  
Triplet Exciton ◽  
Nuclear Relaxation ◽  
One Dimensional

Spin-Forbidden Excitation Enables Infrared Photoredox Catalysis

2020 ◽  
Author(s):  
Tomislav Rovis ◽  
Benjamin D. Ravetz ◽  
Nicholas E. S. Tay ◽  
Candice Joe ◽  
Melda Sezen-Edmonds ◽  
...  
Keyword(s):  
Excited State ◽  
Ground State ◽  
Intersystem Crossing ◽  
Photoredox Catalysis ◽  
Infrared Irradiation ◽  
Triplet Excitation ◽  
New Family ◽  
Ir Light

We describe a new family of catalysts that undergo direct ground state singlet to excited state triplet excitation with IR light, leading to photoredox catalysis without the energy waste associated with intersystem crossing. The finding allows a mole scale reaction in batch using infrared irradiation.

Device-Based Probe of Triplet Exciton Diffusion in Singlet Fission Materials

2021 ◽  
Vol 12 (3) ◽  
pp. 966-972
Author(s):  
Tao Zhang ◽  
Deepesh Rai ◽  
Russell J. Holmes
Keyword(s):  
Triplet Exciton ◽  
Singlet Fission ◽  
Exciton Diffusion

scholarly journals Intersystem crossing processes in the 2CzPN emitter: a DFT/MRCI study including vibrational spin–orbit interactions

2021 ◽  
Vol 23 (5) ◽  
pp. 3668-3678
Author(s):  
Angela Rodriguez-Serrano ◽  
Fabian Dinkelbach ◽  
Christel M. Marian
Keyword(s):  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Intersystem Crossing ◽  
Spin Orbit ◽  
Spin Orbit Interactions

Multireference quantum chemical calculations were performed in order to investigate the (reverse) intersystem crossing ((R)ISC) mechanisms of 4,5-di(9H-carbazol-9-yl)-phthalonitrile (2CzPN).

Electron transfer sensitized photolysis of 'onium salts

1988 ◽  
Vol 66 (2) ◽  
pp. 319-324 ◽  
Author(s):  
R. J. DeVoe ◽  
M. R. V. Sahyun ◽  
Einhard Schmidt ◽  
N. Serpone ◽  
D. K. Sharma
Keyword(s):  
Electron Transfer ◽  
Flash Photolysis ◽  
Laser Flash Photolysis ◽  
Laser Flash ◽  
Quantitative Model ◽  
Intersystem Crossing ◽  
Single Electron Transfer ◽  
Onium Salts ◽  
Encounter Complex ◽  
Back Electron Transfer

We have studied the anthracene-sensitized photolyses of both diphenyliodonium and triphenylsulphonium salts in solution using both steady-state and laser flash photolysis techniques. Photoproducts, namely, phenylated anthracenes along with iodobenzene or diphenylsulphide, respectively, are obtained from both salts with quantum efficiencies of ca. 0.1 at 375 nm. We infer the intermediacy of diphenyliodo and triphenylsulphur radicals formed by single electron transfer from the singlet-excited anthracene. We have developed a quantitative model of this chemistry, and identify the principal sources of inefficiency as back electron transfer, which occurs at nearly the theoretically limiting rate, intersystem crossing from the initially formed sensitizer–'onium salt encounter complex, and in-cage radical recombination.

scholarly journals Supernova constraints on an axion-photon-dark photon interaction

2021 ◽  
Vol 2021 (6) ◽  
Author(s):  
Anson Hook ◽  
Gustavo Marques-Tavares ◽  
Clayton Ristow
Keyword(s):  
Longitudinal Mode ◽  
Transverse Mode ◽  
The Other ◽  
Unusual Feature ◽  
Dark Sector ◽  
Longitudinal Modes ◽  
Dark Photon ◽  
Transverse Modes ◽  
Weakly Coupled ◽  
Photon Coupling

Abstract We present the supernova constraints on an axion-photon-dark photon coupling, which can be the leading coupling to dark sector models and can also lead to dramatic changes to axion cosmology. We show that the supernova bound on this coupling has two unusual features. One occurs because the scattering that leads to the trapping regime converts axions and dark photons into each other. Thus, if one of the two new particles is sufficiently massive, both production and scattering become suppressed and the bounds from bulk emission and trapped (area) emission both weaken exponentially and do not intersection The other unusual feature occurs because for light dark photons, longitudinal modes couple more weakly than transverse modes do. Since the longitudinal mode is more weakly coupled, it can still cause excessive cooling even if the transverse mode is trapped. Thus, the supernova constraints for massive dark photons look like two independent supernova bounds super-imposed on top of each other.

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