Ideal Molecular Design of Blue Thermally Activated Delayed Fluorescent Emitter for High Efficiency, Small Singlet–Triplet Energy Splitting, Low Efficiency Roll-Off, and Long Lifetime

2016 ◽  
Vol 8 (35) ◽  
pp. 23190-23196 ◽  
Author(s):  
Dong Ryun Lee ◽  
Jeong Min Choi ◽  
Chil Won Lee ◽  
Jun Yeob Lee
Keyword(s):  
High Efficiency ◽  
Molecular Design ◽  
Energy Splitting ◽  
Triplet Energy ◽  
Thermally Activated ◽  
Long Lifetime ◽  
Low Efficiency

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.

Simultaneous realization of high-efficiency, low-drive voltage, and long lifetime TADF OLEDs by multifunctional hole-transporters

2020 ◽  
Vol 8 (21) ◽  
pp. 7200-7210 ◽  
Author(s):  
Takahiro Kamata ◽  
Hisahiro Sasabe ◽  
Nozomi Ito ◽  
Yoshihito Sukegawa ◽  
Ayato Arai ◽  
...  
Keyword(s):  
High Efficiency ◽  
Triplet Energy ◽  
Energy Hole ◽  
Light Emitting ◽  
Drive Voltage ◽  
Light Emitting Devices ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Organic Light ◽  
Long Lifetime

A smart high-triplet energy hole-transporter exhibits significant stability in the anion state realizing record-breaking highly efficient and long-living thermally activated delayed fluorescent (TADF) organic light-emitting devices (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).

Molecular Design Opening Two Emission Pathways for High Efficiency and Long Lifetime in Thermally Activated Delayed Fluorescent Organic Light-Emitting Diodes

2021 ◽  
Author(s):  
Ha Lim Lee ◽  
Kyung Hyung Lee ◽  
Jun Yeob Lee ◽  
Ho Jung Lee
Keyword(s):  
Quantum Yield ◽  
High Efficiency ◽  
Light Emitting Diodes ◽  
Molecular Design ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Thermally Activated ◽  
Photoluminescence Quantum Yield ◽  
Organic Light ◽  
Long Lifetime

High efficiency and long lifetime thermally activated delayed fluorescent (TADF) organic light-emitting diodes (OLEDs) were developed using a novel molecular design with two emission pathways for high photoluminescence quantum yield...

High efficiency and long lifetime orange-red thermally activated delayed fluorescent organic light emitting diodes by donor and acceptor engineering

2021 ◽  
Author(s):  
Shantaram Kothavale ◽  
Won Jae Chung ◽  
Jun Yeob Lee
Keyword(s):  
High Efficiency ◽  
Molecular Design ◽  
Wavelength Region ◽  
Organic Light Emitting Diodes ◽  
Light Emitting ◽  
Long Wavelength ◽  
Thermally Activated ◽  
Organic Light ◽  
Donor And Acceptor ◽  
Long Lifetime

Molecular design approach for the simultaneous achievement of high efficiency and long lifetime in the long wavelength region.

scholarly journals High efficiency blue organic light-emitting diodes with below-bandgap electroluminescence

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Maria Vasilopoulou ◽  
Abd. Rashid bin Mohd Yusoff ◽  
Matyas Daboczi ◽  
Julio Conforto ◽  
Anderson Emanuel Ximim Gavim ◽  
...  
Keyword(s):  
High Efficiency ◽  
Light Emitting Diodes ◽  
High Mobility ◽  
Organic Light Emitting Diodes ◽  
Triplet Energy ◽  
Material Interface ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Hole Transporting

AbstractBlue organic light-emitting diodes require high triplet interlayer materials, which induce large energetic barriers at the interfaces resulting in high device voltages and reduced efficiencies. Here, we alleviate this issue by designing a low triplet energy hole transporting interlayer with high mobility, combined with an interface exciplex that confines excitons at the emissive layer/electron transporting material interface. As a result, blue thermally activated delay fluorescent organic light-emitting diodes with a below-bandgap turn-on voltage of 2.5 V and an external quantum efficiency (EQE) of 41.2% were successfully fabricated. These devices also showed suppressed efficiency roll-off maintaining an EQE of 34.8% at 1000 cd m−2. Our approach paves the way for further progress through exploring alternative device engineering approaches instead of only focusing on the demanding synthesis of organic compounds with complex structures.

Electrostatic potential dispersing pyrimidine-5-carbonitrile acceptor for high efficiency and long lifetime thermally activated delayed fluorescence organic light-emitting diodes

2019 ◽  
Vol 7 (40) ◽  
pp. 12695-12703 ◽  
Author(s):  
Ji Seon Jang ◽  
Ha Lim Lee ◽  
Kyung Hyung Lee ◽  
Jun Yeob Lee
Keyword(s):  
Electrostatic Potential ◽  
High Efficiency ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Long Lifetime ◽  
Acceptor Moiety

Pyrimidine-5-carbonitrile was developed as an electrostatic potential managing and strong acceptor moiety of thermally activated delayed fluorescent (TADF) emitters for high efficiency and long lifetime in devices.

Forcing dimethylacridine crooking to improve the efficiency of orange-red thermally activated delayed fluorescent emitters

2020 ◽  
Vol 8 (30) ◽  
pp. 10416-10421
Author(s):  
Feng-Yan Hao ◽  
Yi-Zhong Shi ◽  
Kai Wang ◽  
Xiao-Chun Fan ◽  
Lin Wu ◽  
...  
Keyword(s):  
Quantum Yield ◽  
Steric Hindrance ◽  
Fluorescence Quantum Yield ◽  
Energy Splitting ◽  
Triplet Energy ◽  
Thermally Activated ◽  
High Fluorescence ◽  
Planar Geometries ◽  
High Fluorescence Quantum Yield

By crooking conventional donor segments via suitable steric hindrance, nearly planar geometries, a small singlet–triplet energy splitting and a high fluorescence quantum yield can be realized simultaneously.

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