Aggregation‐Induced Emission with Long‐Lived Room‐Temperature Phosphorescence from Methylene‐Linked Organic Donor–Acceptor Structures

2018 ◽  
Vol 14 (6) ◽  
pp. 751-754 ◽  
Author(s):  
Biao Chen ◽  
Xuepeng Zhang ◽  
Yucai Wang ◽  
Hui Miao ◽  
Guoqing Zhang
Keyword(s):  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Aggregation Induced Emission ◽  
Donor Acceptor

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%.

Highly Efficient Purely Organic Room-Temperature Phosphorescence Film based on a Selenium-Containing Emitter for Sensitive Oxygen Detection

2021 ◽  
Author(s):  
Shuai Wang ◽  
Haiyang Shu ◽  
Xianchao Han ◽  
Xiaofu Wu ◽  
Hui Tong ◽  
...  
Keyword(s):  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Oxygen Detection ◽  
Highly Efficient ◽  
Donor Acceptor

Developing pure organic room temperature phosphorescence (RTP) materials with high phosphorescence efficiency in film states is important for their applications but remains a great challenge. Herein, a donor-acceptor type RTP...

Donor-acceptor structure of coordination polymer with long-lived room temperature phosphorescence and angle-dependent polarized emission

CrystEngComm ◽  
2021 ◽  
Author(s):  
Wen-Jing Qin ◽  
Ji-Rui Zhang ◽  
Xu-Ke Tian ◽  
Xiao-Gang Yang ◽  
Yuming Guo
Keyword(s):  
Coordination Polymer ◽  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Polarized Emission ◽  
New Strategy ◽  
Donor Acceptor

A new strategy to achieve long-lived room temperature phosphorescence performance has been developed by the formation of donor-acceptor structure in coordination polymer, which features lifetime (40.22 ms) three orders of...

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 A General Design Principle for Aggregation-Induced Room-Temperature Phosphorescence via An sp3-Linked Donor-Acceptor Structure

2020 ◽  
Author(s):  
Tao Wang ◽  
Zhubin Hu ◽  
Xiancheng Nie ◽  
Xiang Sun ◽  
Guoqing Zhang
Keyword(s):  
Single Molecule ◽  
Room Temperature ◽  
Theoretical Calculations ◽  
Room Temperature Phosphorescence ◽  
Temperature Estimation ◽  
Emission Color ◽  
Donor And Acceptor ◽  
Color Tunable ◽  
Intramolecular Motion ◽  
Donor Acceptor

<p>Intramolecular motion is commonly more detrimental to room-temperature phosphorescence (RTP) than to prompt fluorescence because long-lived triplet excitons offer more possibilities of quenching. Inspired by the mechanism of aggregation-induced emission (AIE), a single molecule is endowed with AIE and RTP features at the same time. By utilizing triphenylamine (TPA) as AIE activator as well as electron donor and an <i>sp</i><sup>3 </sup>linkers as a bridge between donor and acceptor, five TPA-based AIE-active RTP luminophores were designed. RTP and low-temperature emissions reveal the co-existence of ternary emission, including fluorescence and dual phosphorescence. Single-crystal analyses and theoretical calculations suggest dual phosphorescence derives from local excitation and charge-transfer component. By utilizing hot exciton emission, color-tunable phosphorescence can act as an indicator for temperature estimation. This combinatory approach pioneers a new route for designing versatile AIE-active RTP materials.</p>

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>

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