Efficiency enhancement in orange red thermally activated delayed fluorescence OLEDs by using a rigid di-indolocarbazole donor moiety

2021 ◽  
pp. 109580
Author(s):  
Jee Hyun Maeng ◽  
Ramanaskanda Braveenth ◽  
Young Hun Jung ◽  
Soon Jae Hwang ◽  
Hyuna Lee ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Efficiency Enhancement ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor Moiety

Controlling the exciton lifetime of blue thermally activated delayed fluorescence emitters using a heteroatom-containing pyridoindole donor moiety

2017 ◽  
Vol 4 (4) ◽  
pp. 619-624 ◽  
Author(s):  
Gyeong Heon Kim ◽  
Raju Lampande ◽  
Joon Beom Im ◽  
Jung Min Lee ◽  
Ju Young Lee ◽  
...  
Keyword(s):  
Molecular Design ◽  
Delayed Fluorescence ◽  
Energy Splitting ◽  
Triplet Energy ◽  
High Quantum Efficiency ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Exciton Lifetime ◽  
Low Efficiency ◽  
Donor Moiety

We demonstrate a promising molecular design approach to achieve short exciton lifetime, small singlet and triplet energy splitting and high photoluminescence quantum yield in thermally activated delayed fluorescence emitters for high quantum efficiency and low efficiency roll-off characteristics in OLEDs.

Reverse Intersystem Crossing Managing Assistant Dopant for High External Quantum Efficiency Red Organic Light-Emitting Diode

2022 ◽  
Author(s):  
Dong Jin Shin ◽  
Seung Chan Kim ◽  
Jun Yeob Lee
Keyword(s):  
Light Emitting Diode ◽  
Delayed Fluorescence ◽  
Intersystem Crossing ◽  
Energy Transfer Rate ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Thermally Activated ◽  
Organic Light ◽  
Donor Moiety

Thermally activated delayed fluorescence (TADF) materials working as an assistant dopant with reduced Dexter energy transfer rate was designed by replacing the donor moiety of 2,3,5,6-tetra(9H-carbazol-9-yl) terephthalonitrile (4CzTPN) with 5H-benzo[4,5]thieno[3,2-c]carbazole...

Blue thermally activated delayed fluorescence emitters with a δ-pyridoindole donor moiety

2018 ◽  
Vol 42 (7) ◽  
pp. 5532-5539 ◽  
Author(s):  
Kyu Man Youn ◽  
Dae Hyun Ahn ◽  
Gyeong Heon Kim ◽  
Durai Karthik ◽  
Ju Young Lee ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor Moiety

Blue TADF emitters with δ-carboline as the donor.

Highly efficient blue organic light-emitting diodes from pyrimidine-based thermally activated delayed fluorescence emitters

2018 ◽  
Vol 6 (9) ◽  
pp. 2351-2359 ◽  
Author(s):  
Bowen Li ◽  
Zhiyi Li ◽  
Taiping Hu ◽  
Yong Zhang ◽  
Ying Wang ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Organic Light ◽  
Donor Moiety

Three highly efficient blue thermally activated delayed fluorescence (TADF) emitters have been synthesized based on pyrimidine, 2-methylpyrimidine and 2-phenylpyrimidine as the acceptor and 10H-spiro[acridan-9,9′-fluorene] as the donor moiety.

A new rigid diindolocarbazole donor moiety for high quantum efficiency thermally activated delayed fluorescence emitter

2018 ◽  
Vol 6 (6) ◽  
pp. 1343-1348 ◽  
Author(s):  
Kwang Jong Kim ◽  
Gyeong Heon Kim ◽  
Raju Lampande ◽  
Dae Hyun Ahn ◽  
Joon Beom Im ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Electron Donor ◽  
Delayed Fluorescence ◽  
High Quantum Efficiency ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
High Quantum ◽  
Donor Moiety

We report a new electron donor moiety (diindolocarbazole) for high performances of thermally activated delayed fluorescence emitters.

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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