Efficient HOMO-LUMO separation by multiple resonance effect toward ultrapure blue thermally activated delayed fluorescence

2016 ◽  
Author(s):  
Takuji Hatakeyama ◽  
Toshiaki Ikuta ◽  
Kazushi Shiren ◽  
Kiichi Nakajima ◽  
Shintaro Nomura ◽  
...  
Keyword(s):  
Resonance Effect ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Multiple Resonance ◽  
Homo Lumo

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

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

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

scholarly journals Photoluminescence and Electrochemiluminescence of Thermally Activated Delayed Fluorescence (TADF) Emitters Containing Diphenylphosphine Chalcogenide-Substituted Carbazole Donors

2021 ◽  
Author(s):  
Shiv Kumar ◽  
Pauline Tourneur ◽  
Jonathan Adsetts ◽  
Michael Wong ◽  
Pachaiyappan Rajamalli ◽  
...  
Keyword(s):  
Emission Spectra ◽  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Polar Media ◽  
Delay Times ◽  
Derivatives Of ◽  
Homo Lumo ◽  
Rising Time ◽  
Insight Into

Aiming to develop efficient blue-emitting thermally activated delayed fluorescence (TADF) compounds, we have designed and synthesized derivatives of the well-known sky-blue emitter 2CzPN that contain electron-accepting phosphine chalcogenide groups to stabilize the HOMO level relative to the pristine compound, thus increasing the HOMO-LUMO gap and blue-shifting the emission wavelength. By cyclic voltammetry, photophysical data and quantum-chemical calculations, it was found that polar solvents and matrices validated the proposed concept, but these trends were not recovered in non-polar media. The suitability of these 2CzPN derivatives in polar matrices for optoelectronic applications was explored with electrochemiluminescence (ECL) by measuring emission delays, radical stability, emission stabilities, emission efficiencies and emission spectra. Some of the 2CzPN derivatives showed an unprecedented delayed onset of the ECL, and delayed rising time to the ECL maximum, as well as long ECL emission decay. All of these mentioned delay times suggest that these luminophores primarily emit via organic long-persistent electrochemiluminescence (OLECL) mechanisms. The derivatization of the donor groups of the emitters affected both the radical stability and the predominant emission mechanism, providing important insight into their potential as emitters in solid-state electroluminescent devices.

The Effect of Molecular Aggregation of Thermally Activated Delayed Fluorescence Sensitizer for Hyperfluorescence in Organic Light-Emitting Diodes

2021 ◽  
Author(s):  
Eun Young Park ◽  
Ji Hyun Park ◽  
Yun-Hi Kim ◽  
Min Chul Suh
Keyword(s):  
Resonance Effect ◽  
Delayed Fluorescence ◽  
Organic Light Emitting Diodes ◽  
Synthetic Material ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Organic Light ◽  
Phenyl Sulfone ◽  
Donor Acceptor

The exciton behavior of a new synthetic material, 11-phenyl-11H-9,16-dioxa-11-aza-4b-boraindeno[1,2-a]naphtho[3,2,1-de] anthracene (Ph-OBNA), which displays a multi-resonance effect, and bis[4-(9,9-dimethyl-9,10-dihydroacridine)phenyl]sulfone (DMAC-DPS) with a donor–acceptor-donor structure was analyzed. First, we conducted quantum mechanical...

Tuning of HOMO-LUMO localization for achieving thermally activated delayed fluorescence

2021 ◽  
pp. 118473
Author(s):  
Rokas Skaisgiris ◽  
Tomas Serevičius ◽  
Jelena Dodonova ◽  
Dovydas Banevičius ◽  
Karolis Kazlauskas ◽  
...  
Keyword(s):  
Delayed Fluorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Homo Lumo

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.

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