Enhanced nonlinear optical responses in donor-acceptor ionic complexes via photo induced energy transfer

Abstract

By complexion of donor and acceptor using ionic interactions, the enhanced nonlinear optical responses of donor-acceptor ionic complexes in aqueous solution were studied with 7-ns laser pulses at 532 nm. The optical limiting performance of negatively charged gold nanoparticles or graphene oxide (Acceptor) was shown to be improved significantly when they were mixed with water-soluble, positively-charged porphyrin (Donor) derivative. In contrast, no enhancement was observed when mixing with negatively-charged porphyrin. Transient absorption studies of the donor-acceptor complexes confirmed that the addition of energy transfer pathway were responsible for excited-state deactivation, which results in the observed enhancement. Fluence, angle-dependent scattering and time correlated single photon counting measurements suggested that the enhanced nonlinear scattering due to faster nonradiative decay should play a major role in the enhanced optical limiting responses.

Fabrication of Hybrid Polymeric Micelles Containing AuNPs and Metalloporphyrin in the Core

“…In addition, these complex micelles also caused strong fluorescence quenching (Figure 4b). It has been reported that AuNPs are excellent electron/energy acceptors while porphyrins are superior electron/energy donors [28,29,30]. Thus, the energy transfer or electron transfer could occur from ZnTPPS to AuNPs, and the quench of fluorescence may indirectly demonstrate that such interactions took place between the gold and porphyrin in the micellar core.…”

Nonlinear Optical Properties of Graphene and Carbon Nanotube Composites

“…An energy transfer model based on the graphene-porphyrin hybrids was developed and verified that the energy transfer from porphyrin to graphene enhances the TPA of the system. The role of energy transfer in the graphene based NLO materials was investigated by Mamidala et al, who blended the electron acceptor GO with positively charged porphyrin and negatively charged porphyrin, respectively (Mamidala et al 2010). The NLO response of the positively charged porphyrin-GO system is much larger than that of the negatively charged porphyrin-GO system, confirming the important role of the energy transfer in such donor-acceptor complexes.…”

Nonlinear optical properties of graphene-based materials

“…Balapanuru et al [57] synthesized a GO-dye charge-transfer complex using a simple ionexchange process, and found that this GO-organic dye charge-transfer complex exhibited enhanced properties for biosensing and optical limiting. Mamidala et al [58] reported the enhanced NLO responses of donor-acceptor ionic complexes in aqueous solutions. The optical limiting performance of a negatively charged GO (acceptor) was shown to improve significantly when it was mixed with a water-soluble, positively-charged porphyrin (donor) derivative because of enhanced nonlinear scattering.…”