The Effect of Heavy Atoms Replacement Sites on the Luminescent Ways of D-A-D Type Diphenyl Sulfone Molecules: Thermally Activated Delayed Fluorescence and Phosphorescence

2021 ◽  
pp. 120249
Author(s):  
Yu-Hao Shi ◽  
Fei Wang ◽  
Guang-Yan Sun ◽  
Yu-Zhong Xie
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Heavy Atoms ◽  
Thermally Activated ◽  
Diphenyl Sulfone ◽  
Fluorescence And Phosphorescence

Thermally Activated Delayed Fluorescence Materials Based on Carbazole/Sulfone

2014 ◽  
Vol 1044-1045 ◽  
pp. 158-163
Author(s):  
Bin Huang ◽  
Wei Jiang ◽  
Yuan Yuan Liu ◽  
Ya An Zhang ◽  
Ya Ping Yang ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Properties ◽  
Energy Gap ◽  
Theoretical Calculations ◽  
Suzuki Coupling ◽  
Delayed Fluorescence ◽  
Coupling Reactions ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Diphenyl Sulfone

A series of bipolar materials for thermally activated delayed fluorescence (TADF) based on carbazole and diphenylsulfone, is synthesized by Ulmann and Suzuki coupling reactions. In these materials, the 3,6-di-tert-butylcarbazole and N-phenylcarbazole group as donors are linked at the 3-, 4-position of diphenyl sulfone. The electronic, photophysical and electrochemical properties of these materials are studied by extensive UV-vis, fluorescence spectroscopic measurements, cyclic voltammetry as well as theoretical calculations. The energy gap between singlet and triplet (△EST) in these materials is tuned from 0.99 eV to 0.24 eV by changing the donor units and the positions of substitution.

Reducing lifetime in Cu(i) complexes with thermally activated delayed fluorescence and phosphorescence promoted by chalcogenolate–diimine ligands

2020 ◽  
Vol 8 (41) ◽  
pp. 14595-14604
Author(s):  
Giliandro Farias ◽  
Cristian A. M. Salla ◽  
Renata S. Heying ◽  
Adailton J. Bortoluzzi ◽  
Sergio F. Curcio ◽  
...  
Keyword(s):  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Spin Orbit Coupling ◽  
Matrix Elements ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Diimine Ligands ◽  
Photoluminescence Lifetime ◽  
Atom Effect ◽  
Fluorescence And Phosphorescence

Cu(i) complexes without the expected heavy atom effect to enhance the spin–orbit coupling matrix elements, but with reduced photoluminescence lifetime.

Luminescence color alteration induced by trapped solvent molecules in crystals of tetrahedral gold(i) complexes: near-unity luminescence mixed with thermally activated delayed fluorescence and phosphorescence

2019 ◽  
Vol 48 (25) ◽  
pp. 9094-9103 ◽  
Author(s):  
Masahisa Osawa ◽  
Hiroto Yamayoshi ◽  
Mikio Hoshino ◽  
Yuya Tanaka ◽  
Munetaka Akita
Keyword(s):  
Crystal Lattice ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Emission Color ◽  
Color Alteration ◽  
Solvent Molecules ◽  
Fluorescence And Phosphorescence ◽  
Luminescence Color

Emission color alteration caused by captured solvent molecules in the crystal lattice of tetrahedral gold(i) complexes.

Solvent Dependence of Structural Dynamics and Spin-flip Processes in 3,4,5-tri(9H-carbazole-9-yl)benzonitrile (ortho-3CzBN)

2020 ◽  
Author(s):  
Masaki Saigo ◽  
Kiyoshi Miyata ◽  
Hajime Nakanotani ◽  
Chihaya Adachi ◽  
Ken Onda
Keyword(s):  
Dft Calculations ◽  
Excited States ◽  
Structural Changes ◽  
Photophysical Properties ◽  
Delayed Fluorescence ◽  
Time Resolved ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Solvent Dependence ◽  
Acetonitrile Solutions

We have investigated the solvent-dependence of structural changes along with intersystem crossing of a thermally activated delayed fluorescence (TADF) molecule, 3,4,5-tri(9H-carbazole-9-yl)benzonitrile (o-3CzBN), in toluene, tetrahydrofuran, and acetonitrile solutions using time-resolved infrared (TR-IR) spectroscopy and DFT calculations. We found that the geometries of the S1 and T1 states are very similar in all solvents though the photophysical properties mostly depend on the solvent. In addition, the time-dependent DFT calculations based on these geometries suggested that the thermally activated delayed fluorescence process of o-3CzBN is governed more by the higher-lying excited states than by the structural changes in the excited states.<br>

New hole transport styrene polymers bearing highly π-extended conjugated side-chain moieties for high-performance solution-processable thermally activated delayed fluorescence OLEDs

2021 ◽  
Vol 12 (11) ◽  
pp. 1692-1699
Author(s):  
Ji Hye Lee ◽  
Jinhyo Hwang ◽  
Chai Won Kim ◽  
Amit Kumar Harit ◽  
Han Young Woo ◽  
...  
Keyword(s):  
High Performance ◽  
High Efficiency ◽  
Delayed Fluorescence ◽  
Hole Transport ◽  
Side Chain ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Turn On ◽  
Solution Processable

New polystyrene-based polymers with high π-extended hole transport pendants were synthesized to obtain a low turn-on voltage and high efficiency in solution-processed green TADF-OLEDs.

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