Intrachain exciton quenching analysis in conjugated polymers by two-photon spectroscopy

2002 ◽  
Vol 116 (8) ◽  
pp. 3449-3454 ◽  
Author(s):  
R. Schroeder ◽  
W. Graupner ◽  
U. Scherf ◽  
B. Ullrich
Keyword(s):  
Conjugated Polymers ◽  
Two Photon ◽  
Quenching Analysis

Two-Photon Spectroscopy of π-Conjugated Polymers:  The Case of Poly[1,6-bis(3,6-dihexadecyl-N-carbazolyl)-2,4-hexadiyne] (PolyDCHD-HS)

2001 ◽  
Vol 105 (32) ◽  
pp. 7759-7764 ◽  
Author(s):  
Laura Moroni ◽  
Pier Remigio Salvi ◽  
Cristina Gellini ◽  
Giovanna Dellepiane ◽  
Davide Comoretto ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Two Photon

scholarly journals Nonlinear Optical Pigments. Two-Photon Absorption in Crosslinked Conjugated Polymers and Prospects for Remote Nonlinear Optical Thermometry

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1670
Author(s):  
Jan K. Zaręba ◽  
Marcin Nyk ◽  
Marek Samoć
Keyword(s):  
Solid State ◽  
Conjugated Polymers ◽  
Nonlinear Optical ◽  
Photon Absorption ◽  
Model Compounds ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Sensing Applications ◽  
Spectrally Resolved ◽  
The Impact

Nonlinear optical (NLO) pigments are compounds insoluble in solvents that exhibit phenomena related to nonlinear optical susceptibilities (χ(n) where n = 2,3,...), e.g., two-photon absorption (2PA) which is related to the imaginary part of χ(3). Determination of spectrally-resolved 2PA properties for NLO pigments of macromolecular nature, such as coordination polymers or crosslinked polymers, has long been a challenging issue due to their particulate form, precluding characterizations with standard techniques such as Z-scan. In this contribution, we investigate thus far unknown spectrally-resolved 2PA properties of a new subclass of NLO pigments—crosslinked conjugated polymers. The studied compounds are built up from electron-donating (triphenylamine) and electron-withdrawing (2,2’-bipyridine) structural fragments joined by vinylene (Pol1) or vinyl(4-ethynylphenyl) (Pol2) aromatic bridges. 2PA properties of these polymers have been characterized in broad spectral range by specially modified two-photon excited fluorescence (TPEF) techniques: solid state TPEF (SSTPEF) and internal standard TPEF (ISTPEF). The impact of self-aggregation of aromatic backbones on the 2PA properties of the polymers has been evaluated through extended comparisons of NLO parameters, i.e., 2PA cross sections (σ2) and molar-mass normalized 2PA merit factors (σ2/M) with those of small-molecular model compounds: Mod1 and Mod2. By doing this, we found that the 2PA response of Pol1 and Pol2 is improved 2–3 times versus respective model compounds in the solid state form. Further comparisons with 2PA results collected for diluted solutions of Mod1 and Mod2 supports the notion that self-aggregated structure contributes to the observed enhancement of 2PA response. On the other hand, it is clear that Pol1 and Pol2 suffer from aggregation-caused quenching phenomenon, well reflected in time-resolved fluorescence properties as well as in relatively low values of quantum yield of fluorescence. Accordingly, despite improved intrinsic 2PA response, the effective intensity of two-photon excited emission for Pol1 and Pol2 is slightly lower relative to Mod1 and Mod2. Finally, we explore temperature-resolved luminescence properties under one- (377 nm), two- (820 nm), and three-photon excitation (1020 nm) conditions of postsynthetically Eu3+-functionalized material, Pol1-Eu, and discuss its suitability for temperature sensing applications.

Coulomb correlations and two-photon spectra of conjugated polymers

1990 ◽  
Vol 171 (1-2) ◽  
pp. 14-18 ◽  
Author(s):  
Z.G. Soos ◽  
P.C.M. McWilliams ◽  
G.W. Hayden
Keyword(s):  
Conjugated Polymers ◽  
Two Photon ◽  
Photon Spectra ◽  
Coulomb Correlations

Water-Soluble Conjugated Polymers for Simultaneous Two-Photon Cell Imaging and Two-Photon Photodynamic Therapy

2013 ◽  
Vol 1 (1) ◽  
pp. 92-99 ◽  
Author(s):  
Xiaoqin Shen ◽  
Lin Li ◽  
Agnes Chow Min Chan ◽  
Nengyue Gao ◽  
Shao Q. Yao ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Conjugated Polymers ◽  
Cell Imaging ◽  
Water Soluble ◽  
Two Photon

A zwitterionic red-emitting water-soluble conjugated polymer with high resistance to nonspecific binding for two-photon cell imaging and good singlet oxygen production capability

2021 ◽  
Author(s):  
Yan-Qin Huang ◽  
Shan-Shan Jiang ◽  
Li-Xiang Pan ◽  
Rui Zhang ◽  
Kun-Lin Liu ◽  
...  
Keyword(s):  
Photodynamic Therapy ◽  
Conjugated Polymers ◽  
Singlet Oxygen ◽  
High Resistance ◽  
Conjugated Polymer ◽  
Cell Imaging ◽  
Water Soluble ◽  
Oxygen Production ◽  
Nonspecific Binding ◽  
Two Photon

Water-soluble conjugated polymers (WSCPs) with dual capability of two-photon imaging and singlet oxygen (1O2) production have become one type of the most promising agents in noninvasive imaging guided photodynamic therapy...

Multiphoton Spectra of Conjugated Polymers

1992 ◽  
Vol 247 ◽  
Author(s):  
Z. G. Soos ◽  
S. Etemad ◽  
R. G. Kepler
Keyword(s):  
Conjugated Polymers ◽  
Internal Standard ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Transfer Integrals ◽  
Atomic Limit ◽  
Interacting Electrons ◽  
Photon Spectra ◽  
Lattice Limit

ABSTRACTMultiphoton excitations of conjugated polymers are related to their optical gap, Eg, which serves as an internal standard. In π-electron models with electron-hole symmetry, the alternation gap Ea is the lowest-energy two-photon absorption (TPA) and increases with the alternation δ of the transfer integrals t(l ± δ) along the backbone. Increasing electron-electron (e-e) correlations shift an intense TPA from 2Eg in the band limit to Eg in the atomic limit. Two-photon spectra and multiphoton resonances in polyenes, polydiacetylenes, and polysilanes are related to interacting electrons in Pariser-Parr-Pople(PPP) models with increasing alternation and either carbon or silicon e-e interactions. Some general features of correlated states of conjugated polymers are discussed in the rigid-lattice limit.

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