scholarly journals Method for accurate experimental determination of singlet and triplet exciton diffusion between thermally activated delayed fluorescence molecules

2021 ◽  
Author(s):  
Marius Jakoby ◽  
Shahriar Heidrich ◽  
Lorenz Graf von Reventlow ◽  
Carl Degitz ◽  
Subeesh Madayanad Suresh ◽  
...  
Keyword(s):  
Experimental Determination ◽  
Delayed Fluorescence ◽  
Triplet Exciton ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Exciton Diffusion

A method for measuring triplet diffusion between TADF molecules is presented, and implications of limited triplet diffusion for OLEDs discussed.

Highly Efficient and Stable Blue Organic Light-Emitting Diodes through Selective Quenching of Long-Living Triplet Exciton of Thermally Activated Delayed Fluorescence Emitter

2021 ◽  
Author(s):  
Won Jae Chung ◽  
Jun Yeob Lee
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Triplet Exciton ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Device Lifetime

In the organic light emitting diodes (OLEDs), the achievement of high efficiency and long device lifetime has been a goal due to the short device lifetime of the high efficiency...

A Universal Thermally Activated Delayed Fluorescence Host with Short Triplet Lifetime for Highly Efficient Phosphorescent OLEDs with Extremely Low Efficiency Roll-off

2021 ◽  
Author(s):  
Jian Fan ◽  
Bangjin Sun ◽  
Kaining Tong ◽  
Xing Chen ◽  
Jian-Li He ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Triplet Exciton ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Exciton Density ◽  
Thermally Activated ◽  
Organic Light ◽  
Low Efficiency ◽  
Triplet Lifetime

Triplet-involved quenching processes lead to significant efficiency roll-off in phosphorescent organic light-emitting diodes (OLEDs). Thermally activated delayed fluorescence (TADF) materials can reduce the triplet exciton density in the emitting layer...

Triplet exciton recycling of a phosphorescent emitter by an up-conversion process using a delayed fluorescence type low triplet energy host material

2016 ◽  
Vol 4 (8) ◽  
pp. 1606-1612 ◽  
Author(s):  
Sang Kyu Jeon ◽  
Chan Seok Oh ◽  
Mounggon Kim ◽  
Kyoung Soo Yook ◽  
Jun Yeob Lee
Keyword(s):  
Delayed Fluorescence ◽  
Triplet Exciton ◽  
Conversion Process ◽  
Host Material ◽  
Triplet Energy ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Blue Phosphorescent

A low triplet energy host material with thermally activated delayed fluorescence character was applied as the host material of a blue phosphorescent emitter and was compared with a high triplet energy host material.

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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