Strong interfacial interactions of ZnS/Cu-TCPP hybrids contribute to excellent nonlinear optical absorption

0D MXene quantum dots/2D MXene derived metal–organic frameworks for enhanced nonlinear optical absorption across spectral and temporal regimes

“…Nevertheless, the introduction of the guest species into V 2 C PMOF to fine-tune the NLO response is an effective method. 47 For Ti 3 C 2 QD/V 2 C PMOF, the minimum normalized transmittance ( T min ) at Z = 0 was 0.61, 0.51, 0.48, 0.37, and 0.32 when the pulse energies were 30, 50, 70, 90, and 110 μJ in Fig. 4e.…”

“…The peaks at 459.6 and 465.6 eV belong to TiO 2 . The Ti 2p high-resolution spectra of Ti 3 C 2 QD/V 2 C PMOF heterostructure are shifted to lower binding energies compared to pure Ti 3 C 2 QD, suggesting that the electron content of Ti 2p is more abundant 47 in the Ti 3 C 2 QD/V 2 C PMOF heterostructure than in pure Ti 3 C 2 QD nanoparticles, possibly due to the electron transfer from V 2 C PMOF to Ti 3 C 2 QD. The results indicate that there are weak interactions exist between Ti 3 C 2 QD and V 2 C PMOF, i.e.…”

“…It is expected to enhance the accumulation effects of energy transfer (ET) and photoinduced electron transfer (PET) between guest species and host templates, 46 promoting the photogenerated carrier formation and the charge separation. 47 Recently, transition metal carbides or carbonitrides, 48 known as MXene, have become new hotspots in NLO research due to unique light-matter interactions, exemplified by species like Ti 3 C 2 MXene. Compared to nanosheets, quantum dots exhibit increased solubility in aqueous solvents and enhanced atomic vacancy densities on account of the quantum size effect.…”

Porphyrin metal–organic frameworks with bilayer and pillar-layered frameworks and third-order nonlinear optical properties

“…[3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Recently, as emerging third-order nonlinear optical (NLO) materials, MOFs have shown potential applications in optical limiting (OL), optical switches and mode-locked laser systems. [18][19][20][21] The third-order NLO performances of MOFs can be regulated by various means including the type of metal ion, 22 interpenetration, 23 encapsulation of guest species, 24 morphology, 25 and even external stimuli such as electric fields. 26 It should be noted that most MOF-based third-order NLO materials are porphyrin MOFs (PMOFs) constructed with π-conjugated porphyrin-based ligands.…”

“…26 It should be noted that most MOF-based third-order NLO materials are porphyrin MOFs (PMOFs) constructed with π-conjugated porphyrin-based ligands. 20,22–24,26–29 As one porphyrin derivative, tetracarboxyphenylporphyrin (TCPP) with a π-conjugated porphyrin ring has been widely employed to synthesize MOFs, 30–53 for example, PPF-1 with a 2-dimensional (2D) layer consists of Zn 2 (CO 2 ) 4 paddlewheel units and TCPP linkers. 54 The 2D layer of PPF-1 can be pillared by bridging N-containing ligands through coordination of the metal centers within the paddlewheels and inside the porphyrin rings forming a 3D framework or a bilayer.…”