P-182: Actual Interpretation of Concentration Quenching Effect on Thermally Activated Delayed Fluorescence in a Solid Film

2018 ◽  
Vol 49 (1) ◽  
pp. 1842-1845
Author(s):  
Hyung Suk Kim ◽  
So-Ra Park ◽  
Min Chul Suh
Keyword(s):  
Delayed Fluorescence ◽  
Concentration Quenching ◽  
Thermally Activated Delayed Fluorescence ◽  
Quenching Effect ◽  
Thermally Activated ◽  
Solid Film ◽  
Concentration Quenching Effect

Ester-functionalized thermally activated delayed fluorescence materials

2021 ◽  
Author(s):  
Hiroshi Tasaki ◽  
So Shikita ◽  
In Seob Park ◽  
Takuma Yasuda
Keyword(s):  
Delayed Fluorescence ◽  
Concentration Quenching ◽  
Thermally Activated Delayed Fluorescence ◽  
Quenching Effect ◽  
Thermally Activated ◽  
Concentration Quenching Effect ◽  
Neat Films

A family of thermally activated delayed fluorescence (TADF) materials functionalized with carboxylate esters is presented herein. Owing to their suppressed concentration-quenching effect in neat films, these ester-functionalized TADF emitters could...

Self-host thermally activated delayed fluorescent dendrimers with flexible chains: an effective strategy for non-doped electroluminescent devices based on solution processing

2016 ◽  
Vol 4 (37) ◽  
pp. 8810-8816 ◽  
Author(s):  
Xinxin Ban ◽  
Wei Jiang ◽  
Tingting Lu ◽  
Xiaofang Jing ◽  
Qifeng Tang ◽  
...  
Keyword(s):  
Concentration Quenching ◽  
Solution Processing ◽  
Effective Strategy ◽  
Electroluminescent Devices ◽  
Quenching Effect ◽  
Thermally Activated ◽  
Fluorescent Dendrimers ◽  
Concentration Quenching Effect

Due to the encapsulation of the emissive core, the concentration quenching effect of the TADF material can be effectively restrained.

scholarly journals Using fluorene to lock electronically active moieties in thermally activated delayed fluorescence emitters for high-performance non-doped organic light-emitting diodes with suppressed roll-off

2021 ◽  
Author(s):  
Lin Wu ◽  
Kai Wang ◽  
Cheng Wang ◽  
Xiao-Chun Fan ◽  
Yi-Zhong Shi ◽  
...  
Keyword(s):  
High Performance ◽  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Concentration Quenching ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light

Two TADF emitters were developed by modifying a reported less successful emitter BP-DPAC with fluorene to suppress concentration quenching. Their non-doped OLEDs displayed excellent EQEs of 22.8% and 21.3% with well-suppressed roll-off.

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>

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