An investigation on photophysical and third–order nonlinear optical properties of novel thermally–stable thiophene–imidazo [2,1-b][1,3,4] thiadiazole based azomethines

Kakekochi, Viprabha; D, Udaya Kumar; Purayil, Nikhil Puthiya; Chandrasekharan, K.

doi:10.1016/j.dyepig.2019.04.033

Cited by 17 publications

(4 citation statements)

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“…7−15 Imines are synthesized under mild reaction conditions, where only water is formed as a byproduct (the reaction is not harmful to the environment), and do not require a complicated purification process and metal catalysts. [7][8][9][10][11]13 The possibility of modification of the azomethine structure through the appropriate selection of amines and carbonyl compounds allows for the preparation of new compounds with the desired properties. Considering the chemical structure of the investigated imines for organic electronics, special attention is paid to heterocyclic azomethines with a thiophene unit.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, new stable, processable organic compounds that are able to meet the continually increasing demands are being sought. − Among the various π-conjugated compounds, azomethines have attracted broad research interest as components in optoelectronic devices. − Imines are synthesized under mild reaction conditions, where only water is formed as a byproduct (the reaction is not harmful to the environment), and do not require a complicated purification process and metal catalysts. − , The possibility of modification of the azomethine structure through the appropriate selection of amines and carbonyl compounds allows for the preparation of new compounds with the desired properties. Considering the chemical structure of the investigated imines for organic electronics, special attention is paid to heterocyclic azomethines with a thiophene unit. − Compounds with a thiophene structure exhibit many desirable properties in optoelectronics, such as low oxidation potentials, low band-gap energy, good electrical conductivity, and chemical and thermal stability. ,− ,, Apart from the various fields of imine applications, they are also investigated as materials for photovoltaic (PV) cells. − Nowadays, they are examined in bulk heterojunctions (BHJs), − dye-sensitized solar cells (DSSCs), and perovskite solar cells (PSCs). − Bogdanow...…”

Section: Introductionmentioning

confidence: 99%

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New Thiophene Imines Acting as Hole Transporting Materials in Photovoltaic Devices

et al. 2020

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Five new unsymmetric thiophene imines end-capped with an electron-donating amine (−NH 2 ) group were obtained using a simple synthetic route, that is, the melt condensation of 2,5-diamino-thiophene-3,4-dicarboxylic acid diethyl ester with commercially available aldehydes. Their thermal stability and electrochemical and photophysical (absorption (UV−vis) and photoluminescence (PL)) properties were examined and density functional theory calculations were performed. The imines were thermally stable above 200 °C. They underwent reduction and oxidation processes and exhibited an energy band gap electrochemically estimated between 1.81 and 2.44 eV. They absorbed radiation from the UV and visible range to 480 nm and showed weak light emission. These compounds were investigated as hole transporting materials in solar cells with the structure FTO/b-TiO 2 /m-TiO 2 /perovskite/imine/Au. The highest photoelectric conversion efficiency was observed for compounds with a morpholine derivative substituent.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Thiophene Imines Acting as Hole Transporting Materials in Photovoltaic Devices

et al. 2020

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“…Among the studied organic molecules, the donor–acceptor (D-A) system is found to be one of the best candidates for NLO applications. The intramolecular charge transfer (ICT) between donor–acceptor pairs (D-A) in organic systems extends the delocalization of π electrons, which in turn provides high polarizability and thus strong nonlinear optical response upon interacting with laser. − One can also modify the electronic structure of the D-A system by appropriate incorporation of a donor and/or acceptor that further improve the molecular polarizability as well as electronic and optoelectronic properties. Moreover, an organic system with extended conjugation with a suitable π electron linker or suitable donor and/or acceptor enhances the NLO activity through enhanced ICT.…”

Section: Introductionmentioning

confidence: 99%

All-Optical Diode Action through Enhanced Nonlinear Response from Polymeric Photonic Crystal Microcavity

Purayil

Kakekochi

Dalimba

et al. 2021

ACS Appl. Electron. Mater.

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The search for materials for nanophotonic devices needs a way to overcome the limitations of weak nonlinear optical response due to reduced size. The requirement of a high-power excitation source for inducing nonlinear effects in the active medium poses a hurdle in realizing all-optical and integrated optoelectronic systems. Nanosized optical materials can be embedded in photonic cavities to enhance its optical nonlinear responses through confinement effects. This report systematically investigates the linear and nonlinear optical properties of polymeric 1D-photonic crystals (PhC) with a defect layer incorporated with an imidazo-thiadiazole derivative small molecule. The nonlinear optical studies were carried out by means of a z-scan technique under nanosecond pulse using a Q-switched Nd:YAG laser operating at 532 nm. The resonant excitation creates strong confinement of light in the photonic microcavity and facilitates strong light–matter interaction that induces nonlinear response at low input intensities. A giant enhancement in the nonlinear absorption and optical limiting action was observed for PhC comparing to the bare sample. The significant enhancement in the absorptive nonlinearity is utilized for realizing a practical, on-chip, passive, all-optical diode with a PhC/Au hybrid structure. The asymmetrical nonlinear absorption of the hybrid structure exhibits non-reciprocal light transmission in the nonlinear regime. The high transmittance contrast ratio for forward/reverse bias operation and cost-effective fabrication methods makes our system a potential candidate toward the realization of compact photonic integrated devices.

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“…This family consists of nonmetal elements including oxygen (O) and sulfur (S), metalloid elements including selenium (Se) and tellurium (Te), and the radioactive metal element including polonium (Po) . As we know, oxygen and sulfur are ubiquitous and essential elements to sustain the functions of all lifeforms. , Additionally, sulfur-containing materials are also applied in the therapeutic field, − electronic and photonic industry, − and as high-refractive-index materials. − As for selenium or tellurium materials, they were reported to possess unique photovoltaic properties − and exhibit responses to redox, coordination, or radiation and then were used as drug-delivery vehicles. − It is foreseeable that materials combining rich and different chalcogen elements are supposed to enjoy multifunctionalities and shows potentials as advanced materials in various fields.…”

Section: Introductionmentioning

confidence: 99%

Three-Component Regio- and Stereoselective Polymerizations toward Functional Chalcogen-Rich Polymers with AIE-Activities

et al. 2019

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Polymers containing rich chalcogen elements are rarely reported due to the lack of facile synthesis methods. Herein, a novel multicomponent polymerization route toward chalcogen-rich polymers was introduced. A series of poly(vinyl sulfones) (PVSs) were synthesized at room temperature using readily prepared monomers. PVSs were generated with high regio- and stereo-selectivity in high yields (up to 92.3%). Rich chalcogen elements endowed PVSs with distingctive multifunctionalities. The PVSs possessed good solubility and film-forming ability. Their thin films exhibited outstanding refractive indices up to 1.8062 at 550.0 nm together with good optical transparency in the visible region. Thin films of some polymers can also be fabricated into well-resolved fluorescent photopatterns by photolithography. Thanks to the unique redox properties of selenium, postmodification by oxidation reaction of P1a/2/3a successfully eliminates the caused heavy atom effect and endow resulting polymers with novel functionality as fluorescent bioprobes for cellular imaging.

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An investigation on photophysical and third–order nonlinear optical properties of novel thermally–stable thiophene–imidazo [2,1-b][1,3,4] thiadiazole based azomethines

Cited by 17 publications

References 50 publications

New Thiophene Imines Acting as Hole Transporting Materials in Photovoltaic Devices

New Thiophene Imines Acting as Hole Transporting Materials in Photovoltaic Devices

All-Optical Diode Action through Enhanced Nonlinear Response from Polymeric Photonic Crystal Microcavity

Three-Component Regio- and Stereoselective Polymerizations toward Functional Chalcogen-Rich Polymers with AIE-Activities

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