Enhanced third order optical nonlinearity in ultrathin amorphous film of tetraphenyl-porphyrin in picosecond regime

Nano-films of carbo-benzene derivatives: Scanning probe microscopy analysis and prospects of use in organic solar cells

“…Notice that the Tauc plot shows additional linear edges for 1, 2 and 3, corresponding to bandgaps of 2.25, 2.33 and 2.64 eV, respectively. Two linear edges in Tauc plots are also commonly observed in other organic materials characterized by structured absorption spectra, such as porphyrins [39][40][41] where the optical gap of lowest energy is the onset of absorption while the one of higher energy is the fundamental energy gap, namely, the energy gap between a combination of the HOMO - Highly ordered self-assembled monolayers of the carbo-benzene 1 and carbo-quinoid 3 are shown in Figs. 3a)-b).…”

Covalent functionalization of few-layer TiS2 with tetraphenylporphyrin: toward a donor–acceptor nanohybrid featuring enhanced nonlinear saturation absorption

“…The former absorption is attributed to S 0 → S 2 singlet transition, and four Q-band peaks arise from S 0 → S 1 singlet vibronic transitions. 70 Regarding the TPP–TiS 2 nanohybrid, the broad absorption band of TiS 2 redshifts to 573.3 nm, which overshadows the Q-bands from TPP. The Soret band is observed at 417.3 nm, 1.4 nm shifting toward shorter wavelengths in comparison to that of TPP alone.…”

Optical, Electrochemical, Third-Order Nonlinear Optical Investigations of 3,4,5-Trimethoxy Phenyl Substituted Non-Aqueous Phthalocyanines

“…Promising novel organic molecules, possessing significant nonlinear optical (NLO) characteristics, are in high demand for various device applications in the fields of photonics, biomedical imaging, optical communications, etc., ( Anusha et al, 2015 ; Venkatram et al, 2008a ). All these organic molecules, like phthalocyanines ( Rao et al, 2000 ; Maya et al, 2003 ; Swain et al, 2014b ; Bharati et al, 2018 ; Venkatram et al, 2008b ), porphyrins, and corroles ( Anusha et al, 2012 ; Sarma et al, 2011 ) are reported frequently possessing strong third-order NLO coefficients and cross-sections ( Swain et al, 2014a ; Bhattacharya et al, 2019a ; Clavian et al, 2019 ; Katturi et al, 2020a ; Katturi et al, 2020b ; Pati et al, 2020 ; Rathi et al, 2020 ; Kumar et al, 2021 ). Phthalocyanines generally have strong colors and are used as dyes.…”