scholarly journals The design of an extended multiple resonance TADF emitter based on a polycyclic amine/carbonyl system

2020 ◽  
Vol 4 (7) ◽  
pp. 2018-2022 ◽  
Author(s):  
Dianming Sun ◽  
Subeesh Madayanad Suresh ◽  
David Hall ◽  
Ming Zhang ◽  
Changfeng Si ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Multiple Resonance ◽  
System P

A green multiple resonance thermally activated delayed fluorescence (MR-TADF) emitter, DDiKTa, is developed by a simple dimerization strategy of the known MR-TADF emitter DiKTa.

Multiple Resonance Effect-Induced Sky-Blue Thermally Activated Delayed Fluorescence with a Narrow Emission Band

2019 ◽  
Vol 21 (23) ◽  
pp. 9311-9314 ◽  
Author(s):  
Susumu Oda ◽  
Bungo Kawakami ◽  
Ryosuke Kawasumi ◽  
Ryota Okita ◽  
Takuji Hatakeyama
Keyword(s):  
Emission Band ◽  
Resonance Effect ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Multiple Resonance ◽  
Narrow Emission

Spin-pair state-induced exceptional magnetic field responses from a thermally activated delayed fluorescence-assisted fluorescent material doping system

2019 ◽  
Vol 21 (32) ◽  
pp. 17673-17686
Author(s):  
Yeqian Hu ◽  
Xiantong Tang ◽  
Ruiheng Pan ◽  
Jinqiu Deng ◽  
Hongqiang Zhu ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Energy Transfer ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Spin Pair ◽  
Thermally Activated ◽  
Transfer Processes ◽  
System P ◽  
Complex Spin ◽  
Pair State

Some exceptional magnetic field responses reflect complex spin-pair states and energy transfer processes in thermally activated delayed fluorescence-assisted fluorescent OLEDs.

Solution‐Processable Pure Green Thermally Activated Delayed Fluorescence Emitter Based on the Multiple Resonance Effect

2020 ◽  
Vol 32 (40) ◽  
pp. 2004072
Author(s):  
Naoya Ikeda ◽  
Susumu Oda ◽  
Ryuji Matsumoto ◽  
Mayu Yoshioka ◽  
Daisuke Fukushima ◽  
...  
Keyword(s):  
Resonance Effect ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Multiple Resonance ◽  
Solution Processable

Ultrapure Blue Thermally Activated Delayed Fluorescence Molecules: Efficient HOMO-LUMO Separation by the Multiple Resonance Effect

2016 ◽  
Vol 28 (14) ◽  
pp. 2777-2781 ◽  
Author(s):  
Takuji Hatakeyama ◽  
Kazushi Shiren ◽  
Kiichi Nakajima ◽  
Shintaro Nomura ◽  
Soichiro Nakatsuka ◽  
...  
Keyword(s):  
Resonance Effect ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Multiple Resonance ◽  
Homo Lumo

scholarly journals Characterization of Excited States in a Multiple-Resonance-Type Thermally Activated Delayed Fluorescence Molecule Using Time-resolved Infrared Spectroscopy

2021 ◽  
Author(s):  
Yuushi Shimoda ◽  
Masaki Saigo ◽  
Tomohiro Ryu ◽  
Takumi Ehara ◽  
Kiyoshi Miyata ◽  
...  
Keyword(s):  
Excited State ◽  
Density Functional ◽  
Photophysical Properties ◽  
Delayed Fluorescence ◽  
Potential Surfaces ◽  
Time Resolved ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Multiple Resonance ◽  
Time Resolved Infrared Spectroscopy

We have investigated the correlation between the photophysical properties and the excited-state detailed characteristics in a multiple-resonance-type thermally activated delayed fluorescence (TADF) molecule, DABNA-1, using time-resolved infrared vibrational spectroscopy. In comparison of the distinctive vibrational spectra in the fingerprint region, 1000 - 1700 cm<sup>-1</sup>, to the simulated spectra by density functional theory calculations, we found the best calculation condition. On the basis of the calculations, we determined the excited-state geometries and molecular orbitals of the lowest excited singlet (S<sub>1</sub>) and triplet (T<sub>1</sub>) states as well as the ground state (S<sub>0</sub>). We revealed that the similarity of the potential surfaces between T<sub>1</sub> and S<sub>0</sub> suppresses the nonradiative decay and causes the high fluorescence quantum yield via TADF process.

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