Application of time-resolved electron paramagnetic resonance spectroscopy in the mechanistic study of thermally activated delayed fluorescence (TADF) materials

2022 ◽  
Author(s):  
Xi Chen ◽  
Xiao Xiao ◽  
Jianzhang Zhao
Keyword(s):  
Electron Paramagnetic Resonance Spectroscopy ◽  
Delayed Fluorescence ◽  
Mechanistic Study ◽  
Resonance Spectroscopy ◽  
Triplet States ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
Light Emitting ◽  
Thermally Activated ◽  
Electron Paramagnetic

Triplet exciton harvesting is crucial in organic light emitting diodes (OLEDs), because the triplet states produced by electron and hole recombination is up to 75% of the total excitons, whereas...

Time-resolved electron paramagnetic resonance spectroscopy of organic free radicals anchored to silica surfaces

1991 ◽  
Vol 95 (26) ◽  
pp. 10547-10549 ◽  
Author(s):  
Malcolm D. E. Forbes ◽  
Katerina E. Dukes ◽  
Tanya L. Myers ◽  
Heather D. Maynard ◽  
Christopher S. Breivogel ◽  
...  
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Free Radicals ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
Silica Surfaces ◽  
Electron Paramagnetic

scholarly journals The Structures, Spectroscopic Properties, and Photodynamic Reactions of Three [RuCl(QN)NO]−Complexes (HQN = 8-Hydroxyquinoline and Its Derivatives) as Potential NO-Donating Drugs

2018 ◽  
Vol 2018 ◽  
pp. 1-9
Author(s):  
Leilei Xie ◽  
Lifang Liu ◽  
Wenming Wang ◽  
Zhiou Ma ◽  
Liqun Xu ◽  
...  
Keyword(s):  
Density Functional ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Energy Levels ◽  
Spectroscopic Properties ◽  
Resonance Spectroscopy ◽  
Electronic Effects ◽  
Paramagnetic Resonance ◽  
Time Resolved ◽  
Potential Applications ◽  
Electron Paramagnetic

The structures and spectral properties of three ruthenium complexes with 8-hydroxyquinoline (Hhqn) and their derivatives 2-methyl-8-quinolinoline (H2mqn) and 2-chloro-8-quiolinoline (H2cqn) as ligands (QN = hqn, 2mqn, or 2cqn) were calculated with density functional theory (DFT) at the B3LYP level. The UV-Vis and IR spectra of the three [RuCl(QN)NO]−complexes were theoretically assigned via DFT calculations. The calculated spectra reasonably correspond to the experimentally measured spectra. Photoinduced NO release was confirmed through spin trapping of the electron paramagnetic resonance spectroscopy (EPR), and the dynamic process of the NO dissociation upon photoirradiation was monitored using time-resolved infrared (IR) spectroscopy. Moreover, the energy levels and related components of frontier orbitals were further analyzed to understand the electronic effects of the substituent groups at the 2nd position of the ligands on their photochemical reactivity. This study provides the basis for the design of NO donors with potential applications in photodynamic therapy.

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