Conformational disorder enabled emission phenomena in heavily doped TADF films

2021 ◽  
Author(s):  
Tomas Serevičius ◽  
Rokas Skaisgiris ◽  
Dalius Gudeika ◽  
Karolis Kazlauskas ◽  
Saulius Jursenas
Keyword(s):  
Delayed Fluorescence ◽  
Emission Peak ◽  
Conformational Disorder ◽  
Thermally Activated Delayed Fluorescence ◽  
Solvation Effects ◽  
Solution State ◽  
Thermally Activated ◽  
Heavily Doped

Thermally activated delayed fluorescence (TADF) compounds doped in solid hosts are prone to undergo solvation effects, similar to those as in solution state. Emission peak shifts and changes in emission...

Single-exponential solid-state delayed fluorescence decay in TADF compounds with minimized conformational disorder

2021 ◽  
Author(s):  
Tomas Serevičius ◽  
Rokas Skaisgiris ◽  
Irina Fiodorova ◽  
Gediminas Kreiza ◽  
Dovydas Banevičius ◽  
...  
Keyword(s):  
Solid State ◽  
Fluorescence Decay ◽  
Delayed Fluorescence ◽  
Conformational Disorder ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Single Exponential

Thermally activated delayed fluorescence (TADF) compounds with rapid triplet upconversion in solutions frequently yields drastically lowered upconversion rates in solid hosts due to the conformational disorder, resulting in prolonged multiexponential...

Simple construction of deep-red hexaazatrinaphthylene-based thermally activated delayed fluorescence emitters for efficient solution-processed OLEDs with a peak at 692 nm

2019 ◽  
Vol 55 (94) ◽  
pp. 14190-14193 ◽  
Author(s):  
Xue Zhou ◽  
Yepeng Xiang ◽  
Shaolong Gong ◽  
Zhanxiang Chen ◽  
Fan Ni ◽  
...  
Keyword(s):  
Nucleophilic Substitution ◽  
Substitution Reaction ◽  
High Performance ◽  
Efficient Solution ◽  
Delayed Fluorescence ◽  
Emission Peak ◽  
Simple Construction ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Electroluminescence Emission

Solution-processable deep-red TADF emitters are simply constructed through a catalyst-free nucleophilic substitution reaction, and enable high-performance OLEDs with an EQE of 4.8% and electroluminescence emission peak at 692 nm.

scholarly journals Strategic Molecular Design of closo-ortho-Carboranyl Luminophore to Manifest Thermally Activated Delayed Fluorescence

2021 ◽  
Author(s):  
Hyunhee So ◽  
Dong Kyun You ◽  
Chan Hee Ryu ◽  
Mingi Kim ◽  
Ji Hye Lee ◽  
...  
Keyword(s):  
Ambient Temperature ◽  
Molecular Design ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Solution State ◽  
Thermally Activated ◽  
Donor Acceptor

In this paper, we propose a strategic molecular design of closo-o-carborane-based donor‒acceptor dyad system that exhibits thermally activated delayed fluorescence (TADF) in solution state at ambient temperature. Planar 9,9-dimethyl-9H-fluorene-based compounds...

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.

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