scholarly journals Suppressing dimer formation by increasing conformational freedom in multi-carbazole thermally activated delayed fluorescence emitters

2021 ◽  
Vol 9 (1) ◽  
pp. 189-198
Author(s):  
Lubna Salah ◽  
Marc K. Etherington ◽  
Ali Shuaib ◽  
Andrew Danos ◽  
Ahmed A. Nazeer ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Dihedral Angles ◽  
Dimer Formation ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Conformational Freedom ◽  
Oled Performance

Twisted carbazoles and shallow dihedral angles provide a defence against dimer formation that adversely affects OLED performance.

scholarly journals Revealing resonance effects and intramolecular dipole interactions in the positional isomers of benzonitrile-core thermally activated delayed fluorescence materials

2019 ◽  
Vol 7 (30) ◽  
pp. 9184-9194 ◽  
Author(s):  
Nadzeya A. Kukhta ◽  
Heather F. Higginbotham ◽  
Tomas Matulaitis ◽  
Andrew Danos ◽  
Aisha N. Bismillah ◽  
...  
Keyword(s):  
Electron Density ◽  
Dipole Interaction ◽  
Delayed Fluorescence ◽  
Dihedral Angles ◽  
Positional Isomers ◽  
Thermally Activated Delayed Fluorescence ◽  
Resonance Effects ◽  
Thermally Activated ◽  
Dipole Interactions ◽  
Donor Acceptor

Rather than donor–acceptor dihedral angles, the TADF performance of DMAC–BZN positional isomers is instead controlled by differences in acceptor strength arising from π-system electron density – along with a through-space dipole interaction.

Minimization of solid-state conformational disorder in donor–acceptor TADF compounds

2020 ◽  
Vol 22 (1) ◽  
pp. 265-272 ◽  
Author(s):  
Tomas Serevičius ◽  
Rokas Skaisgiris ◽  
Jelena Dodonova ◽  
Karolis Kazlauskas ◽  
Saulius Juršėnas ◽  
...  
Keyword(s):  
Solid State ◽  
Delayed Fluorescence ◽  
Conformational Disorder ◽  
Thermally Activated Delayed Fluorescence ◽  
Emission Properties ◽  
Thermally Activated ◽  
Donor Acceptor ◽  
Oled Performance

Thermally activated delayed fluorescence (TADF) compounds with a flexible donor–acceptor structure suffer from conformational disorder in solid-state, which deteriorates their emission properties as well as OLED performance.

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.

scholarly journals Molecular design of efficient yellow- to red-emissive alkynylgold(iii) complexes for the realization of thermally activated delayed fluorescence (TADF) and their applications in solution-processed organic light-emitting devices

2021 ◽  
Author(s):  
Cathay Chai Au-Yeung ◽  
Lok-Kwan Li ◽  
Man-Chung Tang ◽  
Shiu-Lun Lai ◽  
Wai-Lung Cheung ◽  
...  
Keyword(s):  
Molecular Design ◽  
Delayed Fluorescence ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Light Emitting Devices ◽  
Thermally Activated ◽  
New Class ◽  
Organic Light ◽  
Tunable Emission

We report the design of a new class of fused heterocyclic alkynyl ligand-containing gold(iii) complexes, which shows tunable emission colors spanning yellow to red region and exhibits thermally activated delayed fluorescence (TADF) properties.

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