Achievement of high efficiency with extremely low efficiency roll-off in solution-processed thermally activated delayed fluorescence OLEDs manufactured using xanthone-based bipolar host materials

2020 ◽  
Vol 8 (20) ◽  
pp. 6780-6787 ◽  
Author(s):  
Chae Yeong Kim ◽  
Chiho Lee ◽  
Hyung Jong Kim ◽  
Jinhyo Hwang ◽  
Mallesham Godumala ◽  
...  
Keyword(s):  
High Efficiency ◽  
Delayed Fluorescence ◽  
Structural Isomers ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Host Materials ◽  
Solution Processable ◽  
Low Efficiency

Two bipolar hosts as structural isomers were designed and synthesized for solution-processable green TADF-OLEDs. Corresponding devices showed excellent EQE over 21% and low efficiency roll-off.

Pyrimidine-based bipolar host materials for high efficiency solution processed green thermally activated delayed fluorescence OLEDs

2020 ◽  
Vol 8 (6) ◽  
pp. 2196-2204 ◽  
Author(s):  
Jiwon Yoon ◽  
Chiho Lee ◽  
Su Hong Park ◽  
Dong Won Kang ◽  
Hyojin Kim ◽  
...  
Keyword(s):  
High Efficiency ◽  
Delayed Fluorescence ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Host Materials ◽  
Solution Processable

In this study, three bipolar host materials (i.e.Py2Cz, Py2BFCz, and Py2ICz) for solution-processable green-emitting TADF-OLEDs were synthesized by coupling 2,4-diphenylpyrimidine to mCP and modifying the carbazole-donating units in the mCP structure.

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.

scholarly journals δ-Carboline-based bipolar host materials for deep blue thermally activated delayed fluorescence OLEDs with high efficiency and low roll-off characteristic

RSC Advances ◽  
2018 ◽  
Vol 8 (31) ◽  
pp. 17025-17033 ◽  
Author(s):  
Ji Su Moon ◽  
Dae Hyun Ahn ◽  
Si Woo Kim ◽  
Seung Yeon Lee ◽  
Ju Young Lee ◽  
...  
Keyword(s):  
External Quantum Efficiency ◽  
High Efficiency ◽  
Delayed Fluorescence ◽  
Triplet Energy ◽  
Characteristic P ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Deep Blue ◽  
Host Materials ◽  
Low Efficiency

We report two new bipolar host materials with ~3.0 eV high triplet energy. Fabricated deep blue TADF OLEDs with these hosts exhibited external quantum efficiency as high as 22.9% and low efficiency roll-off (19.2% at 1000 cd m–2).

Chromenopyrazole-based bipolar host materials for solution-processable thermally activated delayed fluorescence OLEDs exhibiting high efficiency and low roll-off

2019 ◽  
Vol 55 (86) ◽  
pp. 12952-12955 ◽  
Author(s):  
Mallesham Godumala ◽  
Jiwon Yoon ◽  
Chiho Lee ◽  
Ji-Eun Jeong ◽  
Sungnam Park ◽  
...  
Keyword(s):  
Electron Acceptor ◽  
High Performance ◽  
High Efficiency ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Host Materials ◽  
Solution Processable

With chromenopyrazole as an electron-acceptor core, two new bipolar host materials (DCzCP and TCzCP) exhibited high performance and low roll-off in solution-processable TADF-OLEDs.

Asymmetric Sky-Blue Thermally Activated Delayed Fluorescence Emitters Bearing Tris(triazolo)triazine Moiety for Solution Processable Organic Light-Emitting Diodes

2022 ◽  
Author(s):  
Zhou Fang ◽  
Shengyue Wang ◽  
Junxu Liao ◽  
Xinrui Chen ◽  
Yuanyuan Zhu ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Solution Processable

Efficient blue thermally activated delayed fluorescence (TADF) emitter is still a challenge in solution-processed organic light-emitting diodes (OLEDs). In this contribution, two asymmetric molecules of TTT-Ac and TTT-2Ac were synthesized...

Tuning the twist angle of thermally activated delayed fluorescence molecules via a dendronization strategy: high-efficiency solution-processed non-doped OLEDs

2017 ◽  
Vol 5 (14) ◽  
pp. 3480-3487 ◽  
Author(s):  
Yifan Li ◽  
Tianheng Chen ◽  
Manli Huang ◽  
Yu Gu ◽  
Shaolong Gong ◽  
...  
Keyword(s):  
Rate Constant ◽  
High Efficiency ◽  
Twist Angle ◽  
Delayed Fluorescence ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

A dendronization strategy on a blue TADF core tunes the twist angle, ΔEST, DF lifetime and rate constant of RISC for high-efficiency solution-processed non-doped OLEDs.

Triazatruxene-based small molecules with thermally activated delayed fluorescence, aggregation-induced emission and mechanochromic luminescence properties for solution-processable nondoped OLEDs

2018 ◽  
Vol 6 (46) ◽  
pp. 12503-12508 ◽  
Author(s):  
Yonghong Chen ◽  
Shumeng Wang ◽  
Xiaofu Wu ◽  
Yuxiang Xu ◽  
Hua Li ◽  
...  
Keyword(s):  
Small Molecules ◽  
Delayed Fluorescence ◽  
Luminescence Properties ◽  
Thermally Activated Delayed Fluorescence ◽  
Aggregation Induced Emission ◽  
Thermally Activated ◽  
Solution Processable ◽  
Low Efficiency ◽  
Mechanochromic Luminescence

Thermally activated delayed fluorescence, aggregation-induced emission and mechanochromic luminescence properties are combined in triazatruxene-based small molecules, which exhibit low efficiency roll-off in OLED devices.

Thermally activated delayed fluorescence enantiomers for solution-processed circularly polarized electroluminescence

2019 ◽  
Vol 7 (46) ◽  
pp. 14511-14516 ◽  
Author(s):  
Sibing Sun ◽  
Jun Wang ◽  
Lingfeng Chen ◽  
Runfeng Chen ◽  
Jibiao Jin ◽  
...  
Keyword(s):  
High Efficiency ◽  
Delayed Fluorescence ◽  
Solution Processed ◽  
Thermally Activated Delayed Fluorescence ◽  
Circularly Polarized ◽  
Thermally Activated

Enantiomers with circularly polarized (CP) thermally activated delayed fluorescence were designed in a chiral-D–A architecture for solution-processed high-efficiency CP-OLEDs.

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