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).

scholarly journals Extremely condensing triplet states of DPEPO-type hosts through constitutional isomerization for high-efficiency deep-blue thermally activated delayed fluorescence diodes

2016 ◽  
Vol 7 (4) ◽  
pp. 2870-2882 ◽  
Author(s):  
Jing Zhang ◽  
Dongxue Ding ◽  
Ying Wei ◽  
Hui Xu
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Efficiency ◽  
State Of The Art ◽  
Delayed Fluorescence ◽  
Triplet States ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Deep Blue ◽  
Art Performance

An asymmetric constitutional isomer of the thermally activated delayed fluorescence (TADF) host DPEPO, named 24′DPEPO, endowed deep-blue TADF diodes with state-of-the-art performance, including external quantum efficiency beyond 20%.

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.

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.

High efficiency pure blue thermally activated delayed fluorescence molecules having 10H-phenoxaborin and acridan units

2015 ◽  
Vol 51 (46) ◽  
pp. 9443-9446 ◽  
Author(s):  
Masaki Numata ◽  
Takuma Yasuda ◽  
Chihaya Adachi
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Efficiency ◽  
Delayed Fluorescence ◽  
New Materials ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

New materials emitting pure blue thermally activated delayed fluorescence achieve 20% external quantum efficiency and exhibit nearly concentration-independent photoluminescence.

Benzothienopyrimidine as a co-planar type rigid acceptor for high external quantum efficiency in thermally activated delayed fluorescence emitters

2019 ◽  
Vol 7 (25) ◽  
pp. 7643-7653 ◽  
Author(s):  
Chan Seok Oh ◽  
Ha Lim Lee ◽  
Wan Pyo Hong ◽  
Jun Yeob Lee
Keyword(s):  
Hydrogen Bonding ◽  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Efficiency ◽  
Delayed Fluorescence ◽  
Planar Structure ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated

Thermally activated delayed fluorescence (TADF) emitters based on a new benzothienopyrimidine acceptor, which is rigid and can form a co-planar structure via hydrogen bonding, were developed as high-efficiency TADF emitters.

Asymmetric-triazine-cored triads as thermally activated delayed fluorescence emitters for high-efficiency yellow OLEDs with slow efficiency roll-off

2016 ◽  
Vol 4 (42) ◽  
pp. 9998-10004 ◽  
Author(s):  
Yepeng Xiang ◽  
Shaolong Gong ◽  
Yongbiao Zhao ◽  
Xiaojun Yin ◽  
Jiajia Luo ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
External Quantum Efficiency ◽  
High Efficiency ◽  
Delayed Fluorescence ◽  
High Luminance ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
First Time

Two asymmetric-triazine triads are demonstrated for the first time as yellow TADF emitters exhibiting a peak external quantum efficiency of 13.0% and an ultra-slow efficiency roll-off of 11.5% at high luminance.

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