Triplet decay-induced negative temperature dependence of the transient photoluminescence decay of thermally activated delayed fluorescence emitter

2017 ◽  
Vol 5 (46) ◽  
pp. 12077-12084 ◽  
Author(s):  
Xiaofang Wei ◽  
Yongzhen Chen ◽  
Ruihong Duan ◽  
Jianjun Liu ◽  
Ruifang Wang ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Temperature Dependence ◽  
Negative Temperature ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Emission Decay ◽  
Photoluminescence Decay

Triplet decay of TADF emitters can be tuned by their molecular structure, leading to the negative temperature dependence of emission decay.

Donor and acceptor interlock by a planar indolo[3,2,1-jk]carbazole for a suppressed non-radiative mechanism in thermally activated delayed fluorescent emitters

2020 ◽  
Vol 8 (41) ◽  
pp. 14490-14498
Author(s):  
Vilas Venunath Patil ◽  
Yun Hwan Park ◽  
Kyung Hyung Lee ◽  
Jun Yeob Lee
Keyword(s):  
Molecular Structure ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor And Acceptor ◽  
Donor Acceptor ◽  
Radiative Mechanism

In this work, we report a novel molecular structure of the thermally activated delayed fluorescence (TADF) emitters with the donor–acceptor structure interlocked by a planar indolo[3,2,1-jk]carbazole (ICz) unit to suppress a non-radiative mechanism.

Temperature dependence of photoluminescence properties in a thermally activated delayed fluorescence emitter

2014 ◽  
Vol 104 (21) ◽  
pp. 213303 ◽  
Author(s):  
Akitsugu Niwa ◽  
Takashi Kobayashi ◽  
Takashi Nagase ◽  
Kenichi Goushi ◽  
Chihaya Adachi ◽  
...  
Keyword(s):  
Temperature Dependence ◽  
Delayed Fluorescence ◽  
Photoluminescence Properties ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

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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