Design of ortho-Substituted Donor-Acceptor Molecules as Highly Efficient Green Thermally Activated Delayed Fluorescent Emitters

2018 ◽  
Vol 72 (8) ◽  
pp. 873-879
Author(s):  
Jae-Ryung Cha ◽  
Myoung-Seon Gong ◽  
Tak Jae Lee ◽  
Tae Hoon Ha ◽  
Chil Won Lee
Keyword(s):  
Thermally Activated ◽  
Highly Efficient ◽  
Donor Acceptor ◽  
Acceptor Molecules

scholarly journals Highly Efficient Thermally Activated Delayed Fluorescence via an Unconjugated Donor–Acceptor System Realizing EQE of Over 30%

2020 ◽  
Vol 32 (48) ◽  
pp. 2003885 ◽  
Author(s):  
Chen‐Chen Peng ◽  
Sheng‐Yi Yang ◽  
Hong‐Cheng Li ◽  
Guo‐Hua Xie ◽  
Lin‐Song Cui ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Donor Acceptor

Highly Twisted Donor–Acceptor Boron Emitter and High Triplet Host Material for Highly Efficient Blue Thermally Activated Delayed Fluorescent Device

2019 ◽  
Vol 11 (16) ◽  
pp. 14909-14916 ◽  
Author(s):  
Dae Hyun Ahn ◽  
Hyuna Lee ◽  
Si Woo Kim ◽  
Durai Karthik ◽  
Jungsub Lee ◽  
...  
Keyword(s):  
Host Material ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Donor Acceptor

scholarly journals High-efficiency blue thermally activated delayed fluorescence from donor–acceptor–donor systems via the through-space conjugation effect

2019 ◽  
Vol 10 (21) ◽  
pp. 5556-5567 ◽  
Author(s):  
Feifei Gao ◽  
Ruiming Du ◽  
Chunmiao Han ◽  
Jing Zhang ◽  
Ying Wei ◽  
...  
Keyword(s):  
High Efficiency ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Conjugation Effect ◽  
Highly Efficient ◽  
Donor Acceptor

Highly efficient sky-blue TADF donor–acceptor–donor molecules were demonstrated, in which 5,10-diphenyl-5,10-dihydrophosphanthrene oxide (DPDPO2A) with the feature of homoconjugation was used as the acceptor to bridge four carbazolyl or 3,6-di-t-butyl-carbazolyl groups.

Extended π-backbone for highly efficient near-infrared thermally activated delayed fluorescence with enhanced horizontal molecular orientation

2022 ◽  
Author(s):  
Jian-Li He ◽  
Yukun Tang ◽  
Kai Zhang ◽  
Yue Zhao ◽  
Yu-Ching Lin ◽  
...  
Keyword(s):  
Molecular Orientation ◽  
Near Infrared ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Donor Acceptor ◽  
Limited Choice

The near-infrared thermally activated delayed fluorescence (NIR-TADF) materials with emission over 700 nm were insufficiently investigated mainly due to the limited choice of strong donor/acceptor units for the molecular construction...

Electrogenerated Chemiluminescence of Donor-Acceptor Molecules with Thermally Activated Delayed Fluorescence

2014 ◽  
Vol 126 (27) ◽  
pp. 7113-7116 ◽  
Author(s):  
Ryoichi Ishimatsu ◽  
Shigeyuki Matsunami ◽  
Takashi Kasahara ◽  
Jun Mizuno ◽  
Tomohiko Edura ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Electrogenerated Chemiluminescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor Acceptor ◽  
Acceptor Molecules

Chiral approach to investigate mechanism of highly efficient thermally activated delayed fluorescence

2021 ◽  
Vol 57 (14) ◽  
pp. 1738-1741
Author(s):  
Kikuya Hayashi ◽  
Arimasa Matsumoto ◽  
Shuzo Hirata
Keyword(s):  
Cotton Effect ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Donor Acceptor

Cancellation of the Cotton effect depending on vibrations of a chiral orthogonal donor–acceptor structure identifies a mechanism of highly efficient delayed fluorescence.

scholarly journals Pyrimidine-based twisted donor–acceptor delayed fluorescence molecules: a new universal platform for highly efficient blue electroluminescence

2017 ◽  
Vol 8 (2) ◽  
pp. 953-960 ◽  
Author(s):  
In Seob Park ◽  
Hideaki Komiyama ◽  
Takuma Yasuda
Keyword(s):  
High Efficiency ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Deep Blue ◽  
Donor Acceptor

High-efficiency deep blue thermally activated delayed fluorescence (TADF) emitters consisting of acridan–pyrimidine donor–acceptor motifs are developed.

scholarly journals Fast Delayed Emission in New Pyridazine-Based Compounds

2021 ◽  
Vol 8 ◽  
Author(s):  
Simonas Krotkus ◽  
Tomas Matulaitis ◽  
Stefan Diesing ◽  
Graeme Copley ◽  
Emily Archer ◽  
...  
Keyword(s):  
Photophysical Properties ◽  
Delayed Fluorescence ◽  
Intersystem Crossing ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Emission Lifetime ◽  
Donor Acceptor ◽  
Acceptor Moiety ◽  
Triplet Harvesting ◽  
Acceptor Molecules

Three novel donor-acceptor molecules comprising the underexplored pyridazine (Pydz) acceptor moiety have been synthesized and their structural, electrochemical and photophysical properties thoroughly characterized. Combining Pydz with two phenoxazine donor units linked via a phenyl bridge in a meta configuration (dPXZMePydz) leads to high reverse intersystem crossing rate kRISC = 3.9 · 106 s−1 and fast thermally activated delayed fluorescence (TADF) with <500 ns delayed emission lifetime. Efficient triplet harvesting via the TADF mechanism is demonstrated in OLEDs using dPXZMePydz as the emitter but does not occur for compounds bearing weaker donor units.

Electrogenerated Chemiluminescence of Donor-Acceptor Molecules with Thermally Activated Delayed Fluorescence

2014 ◽  
Vol 53 (27) ◽  
pp. 6993-6996 ◽  
Author(s):  
Ryoichi Ishimatsu ◽  
Shigeyuki Matsunami ◽  
Takashi Kasahara ◽  
Jun Mizuno ◽  
Tomohiko Edura ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Electrogenerated Chemiluminescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor Acceptor ◽  
Acceptor Molecules

Highly efficient electroluminescence from purely organic donor–acceptor systems

2015 ◽  
Vol 87 (7) ◽  
pp. 627-638 ◽  
Author(s):  
Katsuyuki Shizu ◽  
Jiyoung Lee ◽  
Hiroyuki Tanaka ◽  
Hiroko Nomura ◽  
Takuma Yasuda ◽  
...  
Keyword(s):  
Energy Difference ◽  
Delayed Fluorescence ◽  
Large Contribution ◽  
Time Resolved ◽  
Light Emitting ◽  
Thermally Activated ◽  
Highly Efficient ◽  
Type Molecule ◽  
Donor Acceptor ◽  
Time Resolved Photoluminescence

AbstractThermally activated delayed fluorescence (TADF) emitters are third-generation electroluminescent materials that realize highly efficient organic light-emitting diodes (OLEDs) without using rare metals. Here, after briefly reviewing the principles of TADF and its use in OLEDs, we report a sky-blue TADF emitter, 9-(4-(benzo[d]thiazol-2-yl)phenyl)-N3,N3,N6,N6-tetraphenyl-9H-carbazole-3,6-diamine (DAC-BTZ). DAC-BTZ is a purely organic donor–acceptor-type molecule with a small energy difference between its lowest excited singlet state and lowest triplet state of 0.18–0.22 eV according to fluorescence and phosphorescence spectra of a DAC-BTZ-doped film. In addition, the doped film exhibits a high photoluminescence quantum yield of 0.82. Time-resolved photoluminescence measurements of the doped film confirm that DAC-BTZ emits TADF. An OLED containing DAC-BTZ as an emitter exhibits a maximum external quantum efficiency (EQE) of 10.3%, which exceeds those obtained with conventional fluorescent emitters (5–7.5%). TADF from DAC-BTZ makes a large contribution to the high EQE of its OLED.

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