Effects of Electron Affinity and Steric Hindrance of the Trifluoromethyl Group on the π‐Bridge in Designing Blue Thermally Activated Delayed Fluorescence Emitters

2020 ◽  
Vol 26 (30) ◽  
pp. 6899-6909 ◽  
Author(s):  
Huiting Li ◽  
Jiuyan Li ◽  
Di Liu ◽  
Tingting Huang ◽  
Deli Li
Keyword(s):  
Electron Affinity ◽  
Steric Hindrance ◽  
Delayed Fluorescence ◽  
Trifluoromethyl Group ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

A comparative study of carbazole-based thermally activated delayed fluorescence emitters with different steric hindrance

2017 ◽  
Vol 5 (19) ◽  
pp. 4797-4803 ◽  
Author(s):  
Kai Wang ◽  
Wei Liu ◽  
Cai-Jun Zheng ◽  
Yi-Zhong Shi ◽  
Ke Liang ◽  
...  
Keyword(s):  
Comparative Study ◽  
Steric Hindrance ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

Two carbazole-based thermally activated delayed fluorescence D–A structure emitters with different steric hindrance were designed and compared.

Thermally activated delayed fluorescence emitters with low concentration sensitivity for highly efficient organic light emitting devices

2019 ◽  
Vol 7 (29) ◽  
pp. 8923-8928 ◽  
Author(s):  
Xiao-Chun Fan ◽  
Kai Wang ◽  
Cai-Jun Zheng ◽  
Gao-Le Dai ◽  
Yi-Zhong Shi ◽  
...  
Keyword(s):  
Steric Hindrance ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Low Concentration ◽  
Light Emitting Devices ◽  
Thermally Activated ◽  
Organic Light ◽  
Concentration Sensitivity ◽  
Molecular Rigidity

By introducing a fluorene group, the molecular rigidity and intermolecular steric hindrance of SPFS-PXZ are greatly improved. As a result, SPFS-PXZ successfully realizes high external quantum efficiencies with low concentration sensitivity in OLEDs.

scholarly journals A sterically hindered asymmetric D–A–D′ thermally activated delayed fluorescence emitter for highly efficient non-doped organic light-emitting diodes

2019 ◽  
Vol 10 (35) ◽  
pp. 8129-8134 ◽  
Author(s):  
Zhan Yang ◽  
Zhu Mao ◽  
Chao Xu ◽  
Xiaojie Chen ◽  
Juan Zhao ◽  
...  
Keyword(s):  
Steric Hindrance ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Design Strategy ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light

An ortho-substituent design strategy promoting steric hindrance has afforded excellent AIE-TADF emitters, and high-efficiency TADF-OLEDs have been subsequently demonstrated.

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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