Solid state light emitting polyaromatic luminogens containing pyrazoline chromophore

Karuppusamy, A.; Kannan, P.; Arulkumar, R.; Venuvanalingam, Ponnambalam

doi:10.1016/j.jlumin.2019.116547

Cited by 8 publications

(3 citation statements)

References 77 publications

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“…[ 181 ] Karuppusamy et al . reported a series of polyaromatic AIE active luminogens 3‐(naphthalen‐1‐yl)‐1‐phenyl‐5‐(pyren‐1‐yl)‐4,5‐dihydro‐1H‐pyrazole (PPN), 3‐(anthracen‐9‐yl)‐1‐phenyl‐5‐(pyren‐1‐yl)‐4,5‐dihydro‐1H‐pyrazole (PPA), and 1‐phenyl‐3,5‐di(pyren‐1‐yl)‐4,5‐dihydro‐1H‐pyrazole (PPP), [ 182 ] with the tunable color emission from the yellow to red, which could also server as saturable absorbers. The open aperture Z‐scan measurements of the four polymers signified the rising transmittance intensity toward focus point and showcased their strong SA properties.…”

Section: Aie Materials For Nlomentioning

confidence: 99%

“…These excellences enable the NLO-active AIE materials as the satisfactory platform to practice NLO applications. The alterations of aggregates draw forth the mutations of intermolecular interactions, [183] packing modes, [184] or the transition dipole moments, and then conquer the field of regulating the NLO properties of AIE materials. From the concentrated solutions to the polymers, crystals, NPs, gels, clusters, and so forth, the distinct aggregates of AIEgens may trigger the disparate NLO effects or the modifications of NLO strength, which are adopted to the different NLO domains.…”

Section: Nlo Applications Of Aie Materialsmentioning

confidence: 99%

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Aggregation‐induced emission materials for nonlinear optics

Han

et al. 2021

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Aggregation‐induced emission (AIE) is a vital photophysical phenomenon that the luminogens in the concentrated or aggregated cases will engender the dramatically boosted emission in comparison with the dispersive states. Given this extraordinary emitting capacity exactly resolves the aggregation‐caused quenching (ACQ) situations residing in the traditional luminophores, the booming AIE luminogens have drawn tremendous interest owing to their advanced performances and colossal potential applications in various areas. Further exploitations of AIE molecules also drive the research interests in the midst of these AIE materials toward the nonlinear optical (NLO) regime. The combination of AIE and NLO effects have nurtured some unforeseen properties of AIE materials and extended their application spheres. Therefore, some NLO‐active AIE materials have been wielded in many crucial applications, for example, optical limiting, laser, bioimaging, and photodynamic therapy. Meanwhile, the impacts of aggregate on the NLO effect also deserve deep considerations and pursuits, and the modifications of aggregates promise an easy, efficient, and prompt avenue to tune the NLO properties of materials. The recent achievements and progress in the NLO properties of AIE materials have been summarized in this review. The second‐order and third‐order NLOs of the AIE materials have been introduced and their correlative applications have been discussed.

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Section: Aie Materials For Nlomentioning

confidence: 99%

Section: Nlo Applications Of Aie Materialsmentioning

confidence: 99%

Aggregation‐induced emission materials for nonlinear optics

Han

et al. 2021

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“…[17,18] In this way, a mechanism playing behind the restriction of twisted molecules and twisted intermolecular charge transfer (TICT) in aggregation was ascribed to RIM for blueshifted emission. [19] Understandably, AIE and AIBSE emergence in the field and rational molecular architecture will build future AIEgen molecules for potential applications. Some pyrazoline compounds displaying AIEE properties have been reported and their aggregation effects well studied.…”

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confidence: 99%

Twisted intramolecular motion arrested in aggregated state emission and the nonlinear optical properties of pyrene pyrazoline derivatives

et al. 2021

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Heterocyclic pyrene pyrazoline moieties containing similar structures but with differences in thiophene (PPT), furan (PPF) and pyridine (PPP) substitutions at the terminal molecules were synthesized. Their aggregation behaviour in THF-water mixtures was investigated and results demonstrated that PPT and PPP exhibited aggregationinduced emission (AIE), whereas PPF exhibited aggregation-induced blue-shifted emission (AIBSE). PPT and PPP provided red-shifted emission, while PPF had observed blue-shifted emission at high water fractions of 70-90%, confirming that aggregation effects played a major role in the molecular structure. Two emission peaks from locally excited and twisted intramolecular charge transfer confirmed the twisted nature from the dihedral angle values of the free reorganized molecules that were completely restricted in high water fractions due to molecular aggregation. This was further confirmed from colour Commission Internationale de l'Eclairage values as well as dynamic light scattering analysis. Third-order nonlinear optical properties were studied using a Nd:Yag laser beam Z-scan technique at 532 nm. The open aperture Z-scan revealed that PPT and PPF towards the peak point endured strong saturable absorption, whereas PPP indicated a strong reverse saturable absorption process. The AIE and AIBSE mechanisms from undergoing restricted twisting intramolecular motion in the aggregated luminogens provide great insight into new developments in AIEgen materials for these optoelectronic materials. K E Y W O R D Saggregation-induced blue-shifted emission, aggregation-induced emission, arylpyrazolines, nonlinear optical materials, organic optoelectronics | INTRODUCTIONFluorescent organic small molecules have received significant attention in modern technology for their vital application in various research areas such as organic light-emitting diodes, [1] organic lasers, [2] organic field effect transistors, [3] organic dye solar cells, [4] organic ligands for detection of hazardous metal ions, [5,6] fluorescent probes [7] and bio-imaging. [8,9] Conventional organic luminophores have drawbacks of molecular aggregation and strong intermolecular or intramolecular interactions; emission losses in solution or in the solid state along with low intensity of emission are known as aggregation-caused quenching (ACQ). [10] These types of molecules are not effectively used and have difficulties for practical application.Modern architecture molecules have brought solutions for all the drawbacks of conventional molecules. The cutting edge technology introduced by Tang and colleagues in 2001 is called aggregationinduced emission (AIE), which is not similar to the ACQ of organic luminophores. [11] AIE is a fascinated technology, purely utilized in

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