Polymorphism of derivatives of tert-butyl substituted acridan and perfluorobiphenyl as sky-blue OLED emitters exhibiting aggregation induced thermally activated delayed fluorescence

2018 ◽  
Vol 6 (48) ◽  
pp. 13179-13189 ◽  
Author(s):  
Iryna Hladka ◽  
Dmytro Volyniuk ◽  
Oleksandr Bezvikonnyi ◽  
Vasyl Kinzhybalo ◽  
Tamara J. Bednarchuk ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Tert Butyl ◽  
Thermally Activated ◽  
Derivatives Of

Blue multi-functional emitters with a perfluorobiphenyl moiety exhibiting polymorphism and changing emission colour.

Aggregation-Enhanced Emission and Thermally Activated Delayed Fluorescence of Derivatives of 9-Phenyl-9H -Carbazole: Effects of Methoxy and tert -Butyl Substituents

2018 ◽  
Vol 24 (38) ◽  
pp. 9581-9591 ◽  
Author(s):  
Gintare Grybauskaite-Kaminskiene ◽  
Dmytro Volyniuk ◽  
Viktorija Mimaite ◽  
Oleksandr Bezvikonnyi ◽  
Audrius Bucinskas ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Tert Butyl ◽  
Thermally Activated ◽  
Derivatives Of

Thermally activated delayed fluorescence materials based on 3,6-di-tert-butyl-9-((phenylsulfonyl)phenyl)-9H-carbazoles

2014 ◽  
Vol 111 ◽  
pp. 135-144 ◽  
Author(s):  
Bin Huang ◽  
Qi Qi ◽  
Wei Jiang ◽  
Jinan Tang ◽  
Yuanyuan Liu ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Tert Butyl ◽  
Thermally Activated

scholarly journals Photoluminescence and Electrochemiluminescence of Thermally Activated Delayed Fluorescence (TADF) Emitters Containing Diphenylphosphine Chalcogenide-Substituted Carbazole Donors

2021 ◽  
Author(s):  
Shiv Kumar ◽  
Pauline Tourneur ◽  
Jonathan Adsetts ◽  
Michael Wong ◽  
Pachaiyappan Rajamalli ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Polar Media ◽  
Delay Times ◽  
Derivatives Of ◽  
Homo Lumo ◽  
Rising Time ◽  
Insight Into

Aiming to develop efficient blue-emitting thermally activated delayed fluorescence (TADF) compounds, we have designed and synthesized derivatives of the well-known sky-blue emitter 2CzPN that contain electron-accepting phosphine chalcogenide groups to stabilize the HOMO level relative to the pristine compound, thus increasing the HOMO-LUMO gap and blue-shifting the emission wavelength. By cyclic voltammetry, photophysical data and quantum-chemical calculations, it was found that polar solvents and matrices validated the proposed concept, but these trends were not recovered in non-polar media. The suitability of these 2CzPN derivatives in polar matrices for optoelectronic applications was explored with electrochemiluminescence (ECL) by measuring emission delays, radical stability, emission stabilities, emission efficiencies and emission spectra. Some of the 2CzPN derivatives showed an unprecedented delayed onset of the ECL, and delayed rising time to the ECL maximum, as well as long ECL emission decay. All of these mentioned delay times suggest that these luminophores primarily emit via organic long-persistent electrochemiluminescence (OLECL) mechanisms. The derivatization of the donor groups of the emitters affected both the radical stability and the predominant emission mechanism, providing important insight into their potential as emitters in solid-state electroluminescent devices.

Thermally activated delayed fluorescence emitters with a m,m-di-tert-butyl-carbazolyl benzoylpyridine core achieving extremely high blue electroluminescence efficiencies

2017 ◽  
Vol 5 (11) ◽  
pp. 2919-2926 ◽  
Author(s):  
Pachaiyappan Rajamalli ◽  
Vasudevan Thangaraji ◽  
Natarajan Senthilkumar ◽  
Chen-Cheng Ren-Wu ◽  
Hao-Wu Lin ◽  
...  
Keyword(s):  
High Performance ◽  
Delayed Fluorescence ◽  
Fine Tuning ◽  
Thermally Activated Delayed Fluorescence ◽  
Tert Butyl ◽  
Thermally Activated

High performance blue OLEDs with maximum EQEs over 28% are achieved from TADF emitters by fine tuning the acceptor unit.

Suppression of aggregation caused quenching in U-shaped thermally activated delayed fluorescence molecules: Tert-butyl effect

2020 ◽  
Vol 219 ◽  
pp. 116899 ◽  
Author(s):  
Guanyu Jiang ◽  
Feiyan Li ◽  
Xiangpeng Kong ◽  
Jianzhong Fan ◽  
Yuzhi Song ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Tert Butyl ◽  
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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