A new Pt­(II) acetylide metallogel material (Pt-1) with 1,3,5-triazine core and 3,4,5-tris­(dodecyloxy)­benzamide terminal units was synthesized and characterized. Its photophysical properties were studied by UV–vis absorption, emission, transient absorption, Z-scan, and nonlinear transmission spectroscopy/technique. Pt-1 exhibits ligand-centered n−π* and 1π–π* transitions in the UV region, and broad, strong absorption bands mixed with intraligand charge transfer (1ILCT)/ligand-to-ligand charge transfer (1LLCT)/metal-to-ligand charge transfer (1MLCT) in the visible spectral region (forward slashes expression indicates that all three processes can be involved, in any proportion). Meanwhile, it shows much stronger triplet transient absorption from the visible to near-infrared region. Thus, the optical power-limiting (OPL) performance of Pt-1 was demonstrated in solution and gel state for a 532 nm nanosecond laser pulse, both of which exhibit a significant decrease of output energy density when the incident light energy increases. In addition, the gel properties of Pt-1 in 15 solvents were studied and a gel sheet with good optical transparency was obtained after cooling the heating sols in dimethylformamide solution. This study can open a new outlet for OPL gelation materials and devices on the basis of the reverse saturable absorption mechanism.

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Recently, graphene-based materials have become well-known nonlinear optical materials for the potential application of laser protection. Two new graphene oxide-platinum  complex (GO-Pt) hybrid materials (GO-Pt-1, GO-Pt-2) have been fabricated through covalent modification and electrostatic adsorption of different Pt complexes with GO. The structural and photophysical properties of the resultant hybrid materials were studied. The nonlinear optical properties and optical power limiting (OPL) performance of Pt complexes, GO, and GO-Pt hybrid materials were investigated by using Z-scan measurements at 532 nm. At the same transmittance, the results illustrate that functionalization of GO makes GO-Pt hybrid materials possess better nonlinear optical properties and OPL performance than individual Pt complexes and GO due to a combination of nonlinear scattering, nonlinear absorption, and photoinduced electron and energy transfer between GO and Pt complex moieties. Furthermore, the nonlinear optics and OPL performance of GO-Pt-2 are better than those of GO-Pt-1, due to not only the excellent optical limiting of Pt-2 and more molecules per area of GO but also the way of combination of Pt-2 and GO.

To understand the fundamental mechanism of aggregation-induced phosphorescent emission (AIPE) and to improve the development of mechanochromic molecules, five new Pt(II) complexes Pt-1–Pt-5 that bear different terminal substituents on 1,3-di(2-pyridyl)benzene...

For the sake of good performance in the nonlinear optical (NLO) application, two S, N-codoped carbon quantum dots (CQDs) were synthesized from 3,7-dinitro-10H-phenothiazine in different condition of alkaline solution (D-1...