Two-photon absorption and optical power limiting properties of ladder-type tetraphenylene cored chromophores with different terminal groups

Heavy atom enhanced generation of singlet oxygen in novel indenofluorene-based two-photon absorbing chromophores for photodynamic therapy

“…Notably, although compound FL-2IS has a longer p-conjugation length, its s 2 value is smaller than those of compounds FL-1IN and FL-2IN, which can be also attributed to the enhancement of ICT by incorporating the strong electron donating diarylamino groups into FL-1IN and FL-2IN. The result is also consistent with our previous studies [24]. Two-photon excited fluorescence (TPEF) spectra of the twophoton absorbing chromophores FL0, FL-2IS, FL-1IN, FL-2IN, and FL-2BrN were recorded in THF solution (2 Â 10 À6 M) at room temperature by using an Ocean Optics s2000 spectrometer in conjunction with a fiber coupler head (Fig.…”

“…Ladder-type oligo-p-phenylenes are good building blocks to construct materials with large TPA cross-section values owning to their planar chemical structures with extended p-conjugation [21,22]. In our previous reports, the relationship between TPA properties of ladder-type oligo-p-phenylene-cored chromophores and their conjugation lengths was systematically investigated [23,24]. It was found that the TPA cross section values of the laddertype oligo-p-phenylenes-cored chromophores increase with the increasing p-conjugation lengths of the central ladder-type oligop-phenylene core.…”

Solvent tuning of photochemistry upon excited-state symmetry breaking

“…Multipolar charge-transfer scaffolds represent one type of materials featuring strong interaction between D-π-A branches, D and A being electron donor and acceptor subunits, arranged in well-defined architectures. Exhibiting advantageous two-photon absorption (TPA) properties 14,15 , they attract attention in various fields, including 3D nanofabrication [16][17][18] , in vivo fluorescence microscopy [19][20][21][22] , power limiting 23,24 and optical uncaging 25 among others [26][27][28][29] .…”

Nonlinear optical properties of metal nanoparticles: a review

“…15 In the past two decades, efficient nonlinear optical materials have made signicant progress in laser technology, and these materials have large nonlinear optical properties and a fast nonlinear response for various photonic and optoelectronic applications such as laser ablation, pulsed laser deposition, optical communication, optical information processing, and optical data storage and as optical limiters. [16][17][18][19][20][21] Optical limiting is one of the most promising practical applications of all nonlinear optical properties and can be used to protect the human eye and photosensitive components of delicate optical instruments from damage caused by intense optical radiation. 22 Optical limiters strongly attenuate a potentially dangerous laser beam while exhibiting a transmittance to low ambient light.…”