Molecular Conformation Modulating Luminescence Switching between Delayed Fluorescence and Room-Temperature Phosphorescence

2021 ◽  
Author(s):  
Yating Wen ◽  
Shengbing Xiao ◽  
Haichao Liu ◽  
Xuzhou Tian ◽  
jianbo De ◽  
...  
Keyword(s):  
Room Temperature ◽  
Molecular Conformation ◽  
Delayed Fluorescence ◽  
Acceptor Molecule ◽  
Room Temperature Phosphorescence ◽  
Dual Emission ◽  
Near Ultraviolet ◽  
Donor Acceptor

A new pure organic donor-acceptor molecule, (4-chlorophenyl)(5H-dibenzo[b,f]azepin-5-yl)methanone (IS-CBZ) was designed and synthesized, which demonstrates near ultraviolet (NUV) delayed fluorescence (DF) and dual emission of NUV DF and yellow room-temperature phosphorescence...

The effect of a heavy atom on the radiative pathways of an emitter with dual conformation, thermally-activated delayed fluorescence and room temperature phosphorescence

2019 ◽  
Vol 7 (34) ◽  
pp. 10481-10490 ◽  
Author(s):  
Daniel de Sa Pereira ◽  
Dong Ryun Lee ◽  
Nadzeya A. Kukhta ◽  
Kyung Hyung Lee ◽  
Cho Long Kim ◽  
...  
Keyword(s):  
Room Temperature ◽  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Acceptor Molecule ◽  
Room Temperature Phosphorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor Acceptor

This study focuses on the photophysics of a donor–acceptor molecule with 2,4,6-triphenyl-1,3,5-triazine and phenoselenazine acceptor and donor units.

scholarly journals Regioisomeric Effect on the Excited-State Fate Leading to Room-Temperature Phosphorescence or Thermally Activated Delayed Fluorescence in a Dibenzophenazine-Cored Donor–Acceptor–Donor System

2021 ◽  
Author(s):  
Takumi Hosono ◽  
Nicolas Oliveira Decarli ◽  
Paola Zimmermann Crocomo ◽  
Tsuyoshi Goya ◽  
Leonardo Evaristo de Sousa ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Delayed Fluorescence ◽  
Quantum Yields ◽  
Room Temperature Phosphorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Light Emitting ◽  
Thermally Activated ◽  
Donor Acceptor ◽  
Emission Behavior

Exploring design principle for switching thermally activated dealyed fluorescecne (TADF) and room temperature phosphorescence (RTP) is a fundamentally imporant research in developing triplet-mediated photofunctional organic materials. Herein systematic studies on the regioisomeric and substituents effects in a twisted donor–acceptor–donor (D–A–D) scaffold (A = dibenzo[a,j]phenazine; D = dihydrophenazasiline) on the fate of the excited state have been performed. The study revealed that the regiosiomerism clearly affects the emission behavior of the D–A–D compounds. Distinct difference in TADF, dual TADF & RTP, and dual RTP were observed, depending on the host used. Furthermore, OLED organic light-emitting diodes (OLEDs) fabricated with the developed emitters achieved high external quantum yields for RTP-based OLEDS up to 7.4%.

Bridge control of photophysical properties in benzothiazole-phenoxazine emitters – from thermally activated delayed fluorescence to room temperature phosphorescence

2022 ◽  
Author(s):  
Simon PAREDIS ◽  
Tom CARDEYNAELS ◽  
Jasper DECKERS ◽  
Andrew Danos ◽  
Dirk Vanderzande ◽  
...  
Keyword(s):  
Room Temperature ◽  
Photophysical Properties ◽  
Phenyl Group ◽  
Delayed Fluorescence ◽  
Room Temperature Phosphorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Thiophene Moiety ◽  
Donor Acceptor

The bridging phenyl group in a fluorescent phenoxazine-benzothiazole donor-acceptor dyad is replaced by either a naphthalene or a thiophene moiety to probe the influence of a more extended conjugated system...

scholarly journals Revealing Internal Heavy Chalcogen Atom Effect on the Photophysics of Dibenzo[a,j]phenazine-Cored Donor–Acceptor–Donor Triad

2021 ◽  
Author(s):  
Shimpei Goto ◽  
Yuya Nitta ◽  
Nicolas Decarli ◽  
Leonardo Evaristo de Sousa ◽  
Patrycja Stachelek ◽  
...  
Keyword(s):  
Room Temperature ◽  
Photophysical Properties ◽  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Room Temperature Phosphorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor Acceptor ◽  
Mechanochromic Luminescence ◽  
Atom Effect

<div><div><div><p>A new twisted donor–acceptor–donor (D–A–D) multi-photofunctional organic molecule comprising of phenoselenazine as the electron-donors (Ds) and dibenzo[a,j]phenazine (DBPHZ) as the electron-acceptor (A) has been developed. The developed selenium-incorporated D–A–D compound is featured with multi-color polymorphism, distinct mechanochromic luminescence, chemically-stimulated luminochromism, thermally-activated delayed fluorescence, and room- temperature phosphorescence. The internal heavy atom effect on the photophysical properties of the D–A–D system has been investigated through the comparison with the physicochemical properties of a previously developed sulfur analogue and a tellurium analogue.</p></div></div></div>

scholarly journals Revealing Internal Heavy Chalcogen Atom Effect on the Photophysics of Dibenzo[a,j]phenazine-Cored Donor–Acceptor–Donor Triad

2021 ◽  
Author(s):  
Shimpei Goto ◽  
Yuya Nitta ◽  
Nicolas Decarli ◽  
Leonardo Evaristo de Sousa ◽  
Patrycja Stachelek ◽  
...  
Keyword(s):  
Room Temperature ◽  
Photophysical Properties ◽  
Heavy Atom ◽  
Delayed Fluorescence ◽  
Room Temperature Phosphorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor Acceptor ◽  
Mechanochromic Luminescence ◽  
Atom Effect

<div><div><div><p>A new twisted donor–acceptor–donor (D–A–D) multi-photofunctional organic molecule comprising of phenoselenazine as the electron-donors (Ds) and dibenzo[a,j]phenazine (DBPHZ) as the electron-acceptor (A) has been developed. The developed selenium-incorporated D–A–D compound is featured with multi-color polymorphism, distinct mechanochromic luminescence, chemically-stimulated luminochromism, thermally-activated delayed fluorescence, and room- temperature phosphorescence. The internal heavy atom effect on the photophysical properties of the D–A–D system has been investigated through the comparison with the physicochemical properties of a previously developed sulfur analogue and a tellurium analogue.</p></div></div></div>

One-step synthesis of cyclic compounds towards easy room-temperature phosphorescence and deep blue thermally activated delayed fluorescence

2018 ◽  
Vol 54 (56) ◽  
pp. 7850-7853 ◽  
Author(s):  
Yingyuan Hu ◽  
Zhenfeng Wang ◽  
Xiaofang Jiang ◽  
Xinyi Cai ◽  
Shi-Jian Su ◽  
...  
Keyword(s):  
Room Temperature ◽  
Delayed Fluorescence ◽  
Room Temperature Phosphorescence ◽  
One Pot ◽  
Dual Emission ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Deep Blue ◽  
One Step ◽  
Cyclic Compounds

Novel cyclic compounds were synthesized by one-pot synthesis and THF-irrigating purification with deep blue thermally activated delayed fluorescence and room-temperature phosphorescence dual emission.

scholarly journals Asymmetric-donor (D2D2′)–acceptor (A) conjugates for simultaneously accessing intrinsic blue-RTP and blue-TADF

2020 ◽  
Vol 1 (6) ◽  
pp. 1858-1865
Author(s):  
Harsh Bhatia ◽  
Debdas Ray
Keyword(s):  
Room Temperature ◽  
Delayed Fluorescence ◽  
Room Temperature Phosphorescence ◽  
Thermally Activated Delayed Fluorescence ◽  
Thermally Activated ◽  
Donor Acceptor

Asymmetric-donor–acceptor (D2D2′–A) conjugates for simultaneously accessing blue room-temperature phosphorescence (BRTP) and blue thermally activated delayed fluorescence (BTADF).

Sign in / Sign up

Export Citation Format

Share Document