Tuning the Photophysical Properties of 2-Quinolinone-Based Donor-Acceptor Molecules throughN- versusO-Alkylation: Insights from Experimental and Theoretical Investigations

2013 ◽  
Vol 2014 (4) ◽  
pp. 753-766 ◽  
Author(s):  
Ganesan Paramaguru ◽  
Rajadurai Vijay Solomon ◽  
Sivanadanam Jagadeeswari ◽  
Ponnambalam Venuvanalingam ◽  
Rajalingam Renganathan
Keyword(s):  
Photophysical Properties ◽  
Theoretical Investigations ◽  
Donor Acceptor ◽  
Acceptor Molecules

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.

scholarly journals Thermochromic aggregation-induced dual phosphorescence via temperature-dependent sp3-linked donor-acceptor electronic coupling

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Tao Wang ◽  
Zhubin Hu ◽  
Xiancheng Nie ◽  
Linkun Huang ◽  
Miao Hui ◽  
...  
Keyword(s):  
Excited State ◽  
Room Temperature ◽  
Electronic Coupling ◽  
Temperature Dependent ◽  
Molecular Systems ◽  
Donor And Acceptor ◽  
Theoretical Investigations ◽  
Donor Acceptor ◽  
And Control ◽  
Two Temperature

AbstractAggregation-induced emission (AIE) has proven to be a viable strategy to achieve highly efficient room temperature phosphorescence (RTP) in bulk by restricting molecular motions. Here, we show that by utilizing triphenylamine (TPA) as an electronic donor that connects to an acceptor via an sp3 linker, six TPA-based AIE-active RTP luminophores were obtained. Distinct dual phosphorescence bands emitting from largely localized donor and acceptor triplet emitting states could be recorded at lowered temperatures; at room temperature, only a merged RTP band is present. Theoretical investigations reveal that the two temperature-dependent phosphorescence bands both originate from local/global minima from the lowest triplet excited state (T1). The reported molecular construct serves as an intermediary case between a fully conjugated donor-acceptor system and a donor/acceptor binary mix, which may provide important clues on the design and control of high-freedom molecular systems with complex excited-state dynamics.

Synthesis, photophysical properties, and computational studies of benzothiadiazole and/or phenothiazine based donor/acceptor π-conjugated copolymers

2021 ◽  
Vol 28 (7) ◽  
Author(s):  
Ashraf A. El-Shehawy ◽  
Morad M. El-Hendawy ◽  
Adel M. Attia ◽  
Abdul-Rahman I. A. Abdallah ◽  
Nabiha I. Abdo
Keyword(s):  
Photophysical Properties ◽  
Computational Studies ◽  
Donor Acceptor ◽  
Conjugated Copolymers

scholarly journals Highly Photostable and Luminescent Donor–Acceptor Molecules for Ultrasensitive Detection of Sulfur Mustard

2021 ◽  
pp. 2002615
Author(s):  
Linfeng Cui ◽  
Yanjun Gong ◽  
Chuanqin Cheng ◽  
Yongxian Guo ◽  
Wei Xiong ◽  
...  
Keyword(s):  
Sulfur Mustard ◽  
Ultrasensitive Detection ◽  
Donor Acceptor ◽  
Acceptor Molecules

Inter versus intra-molecular photoinduced charge separation in solid films of donor–acceptor molecules

2008 ◽  
pp. 4915 ◽  
Author(s):  
Safa Shoaee ◽  
Mattias P. Eng ◽  
Zesheng An ◽  
Xuan Zhang ◽  
Stephen Barlow ◽  
...  
Keyword(s):  
Charge Separation ◽  
Solid Films ◽  
Photoinduced Charge Separation ◽  
Donor Acceptor ◽  
Photoinduced Charge ◽  
Acceptor Molecules
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