Direct observation of the rise of delayed fluorescence in dithienylbenzothiadiazole and its role in the excited state dynamics of a donor–acceptor–donor molecule

2017 ◽  
Vol 19 (13) ◽  
pp. 9118-9127 ◽  
Author(s):  
Maneesha Esther Mohanty ◽  
Chakali Madhu ◽  
Vanammoole Lakshmi Reddy ◽  
Mahalingavelar Paramasivam ◽  
Prakriti Ranjan Bangal ◽  
...  
Keyword(s):  
Excited State ◽  
Direct Observation ◽  
Delayed Fluorescence ◽  
Intersystem Crossing ◽  
Donor Molecule ◽  
Excited State Dynamics ◽  
Donor Acceptor

Fast reverse intersystem crossing in a donor–acceptor system used in OLED and OPV materials.

scholarly journals Regioisomeric Effect on the Excited-State Fate Leading to Room-Temperature Phosphorescence or Thermally Activated Delayed Fluorescence in a Dibenzophenazine-Cored Donor–Acceptor–Donor System

2021 ◽  
Author(s):  
Takumi Hosono ◽  
Nicolas Oliveira Decarli ◽  
Paola Zimmermann Crocomo ◽  
Tsuyoshi Goya ◽  
Leonardo Evaristo de Sousa ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Delayed Fluorescence ◽  
Quantum Yields ◽  
Room Temperature Phosphorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Donor Acceptor ◽  
Emission Behavior

Exploring design principle for switching thermally activated dealyed fluorescecne (TADF) and room temperature phosphorescence (RTP) is a fundamentally imporant research in developing triplet-mediated photofunctional organic materials. Herein systematic studies on the regioisomeric and substituents effects in a twisted donor–acceptor–donor (D–A–D) scaffold (A = dibenzo[a,j]phenazine; D = dihydrophenazasiline) on the fate of the excited state have been performed. The study revealed that the regiosiomerism clearly affects the emission behavior of the D–A–D compounds. Distinct difference in TADF, dual TADF & RTP, and dual RTP were observed, depending on the host used. Furthermore, OLED organic light-emitting diodes (OLEDs) fabricated with the developed emitters achieved high external quantum yields for RTP-based OLEDS up to 7.4%.

scholarly journals Excited state dynamics of protonated keto uracil: intersystem crossing pathways in competition

2021 ◽  
Vol 75 (1) ◽  
Author(s):  
Jordan Dezalay ◽  
Michel Broquier ◽  
Satchin Soorkia ◽  
Gilles Grégoire
Keyword(s):  
Excited State ◽  
Intersystem Crossing ◽  
Excited State Dynamics

Ultrafast Excited-State Dynamics of Donor–Acceptor Biaryls: Comparison between Pyridinium and Pyrylium Phenolates

2013 ◽  
Vol 117 (49) ◽  
pp. 13112-13126 ◽  
Author(s):  
Romain Letrun ◽  
Marius Koch ◽  
Marina L. Dekhtyar ◽  
Vladimir V. Kurdyukov ◽  
Alexei I. Tolmachev ◽  
...  
Keyword(s):  
Excited State ◽  
Excited State Dynamics ◽  
Donor Acceptor

scholarly journals Visualizing excited state dynamics of conjugated molecules trough femtosecond stimulated Raman scattering

2019 ◽  
Vol 205 ◽  
pp. 09015
Author(s):  
Batignani Giovanni ◽  
Pontecorvo Emanuele ◽  
Ferrante Carino ◽  
Aschi Massimiliano ◽  
Elles Christopher G. ◽  
...  
Keyword(s):  
Excited State ◽  
Raman Scattering ◽  
Model Compound ◽  
Stimulated Raman Scattering ◽  
Reaction Pathway ◽  
Structural Rearrangement ◽  
Intersystem Crossing ◽  
Conjugated Molecules ◽  
Excited State Dynamics ◽  
Stimulated Raman

The reaction pathway in the photoexcited model compound 2-methyl-5-phenylthiophene has been unravelled by Femtosecond Stimulated Raman Scattering and quantum chemical calculations. The excited state dynamics, including structural rearrangement, vibrational cooling and intersystem-crossing, will be presented.

Efficient intersystem crossing using singly halogenated carbomethoxyphenyl porphyrins measured using delayed fluorescence, chemical quenching, and singlet oxygen emission

2015 ◽  
Vol 17 (43) ◽  
pp. 29090-29096 ◽  
Author(s):  
Dawn M. Marin ◽  
Sonia Payerpaj ◽  
Graham S. Collier ◽  
Angy L. Ortiz ◽  
Gaurav Singh ◽  
...  
Keyword(s):  
Excited State ◽  
Singlet Oxygen ◽  
State Formation ◽  
Delayed Fluorescence ◽  
Intersystem Crossing ◽  
Fluorescence Lifetimes ◽  
Triplet Excited State

Singly halogenated carbomethoxyphenylporphyrins show decreased singlet fluorescence lifetimes and increased rates of triplet excited state formation.

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