Metal-free carbazole scaffold dyes as potential nonlinear optical phores: molecular engineering

Abstract

In light of the diverse applications of nonlinear optical (NLO) chromophores in the interdisciplinary fields, there is an absolute demand for the quest of cost-effective, facilely processible smart materials. To...

Flexible and Transparent Oligothiophene-o-Carborane-Containing Hybrid Films for Nonlinear Optical Limiting Based on Efficient Two-Photon Absorption

“…Among the kinds of important third-order NLO properties, two-photon absorption (2PA), and two-photon excited fluorescence (2PEF) have been widely developed. − Previous reports have discovered that performance-tailored two-photon absorbing chromophores can be tuned by the factors such as length and strength of conjugation, dimensionality of charge-transfer network, solvent polarity, self-aggregation, intra- or intermolecular interaction, and micellar encapsulation, etc . In principles involving donor–acceptor (D–A) molecular structures, intramolecular charge transfer (ICT), electronic delocalization, and permanent transition dipole moments (Δμ) between ground state and excited state play important roles to the related 2PA characteristics. − In view of the common phenomena of aggregation-caused quenching (ACQ), solid-state emissive systems with aggregation-induced emission (AIE), color-tunable properties and high fluorescence quantum yields (Φ F ) have drawn immense attention. , We know that conjugated organic chromophores are very important in designing and developing new NLO devices, and their third-order NLO response result from the delocalization behavior of D–A interactions and π-electrons . In this respect, novel AIEgens with excellent NLO performances as well as strong solid emission would be very interesting and challenging.…”

Boosting the optical limiting properties of helicene-containing arene to the linear analogue

“…4 and S22), the nonlinear absorption coe cients (β eff ) and saturation absorption coe cient (I s ) at 30 µJ energy have been examined to be 17.69 cm/GW, 0.217 GW/cm 2 for 5, and 15.09 cm/GW and 0.35 GW/cm 2 for 8, respectively, being superior and close to some similar material previously reported. 49,50 The values of entering into the optical power limiting are 0.132 J/cm 2 for 5 and 0.29 J/cm 2 for 8., respectively (Fig. 4b and 4d).…”

Ligand-regulated three-photon AIE properties of manganese(ii) complexes for photodynamic therapy

“…As we all know, carbazole is a typical long-life blue emission material, whose derivatives are widely used as nonlinear optical (NLO) materials and organic room temperature phosphorescence (RTP) materials. 9,10 Ying Yu et al synthesized a twophoton AIE source benzothiadiazol-7-ylidene malononitrile with a D-A structure for tracking lipid droplets. 11 Niu Niu et al reported a NIR-emitting photosensitizer that targets the cell membrane.…”