Two-photon absorption in conjugated polymers: Contributions of excitonic and biexcitonic states

1994 ◽  
Vol 50 (7) ◽  
pp. 4306-4315 ◽  
Author(s):  
V. A. Shakin ◽  
Shuji Abe
Keyword(s):  
Conjugated Polymers ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
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.

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.

Two-photon absorption properties of hyperbranched conjugated polymers with triphenylamine as the core

Polymer ◽  
2004 ◽  
Vol 45 (21) ◽  
pp. 7143-7149 ◽  
Author(s):  
Jian Li Hua ◽  
Bo Li ◽  
Fan Shun Meng ◽  
Fang Ding ◽  
Shi Xiong Qian ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon ◽  
The Core

Cross-Conjugated Polymers with Large Two-Photon Absorption Cross-Sections for Metal Ion Sensing

2007 ◽  
Vol 111 (28) ◽  
pp. 10673-10681 ◽  
Author(s):  
Fei Huang ◽  
Yanqing Tian ◽  
Ching-Yi Chen ◽  
Yen-Ju Cheng ◽  
A. Cody Young ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Cross Sections ◽  
Metal Ion ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Ion Sensing ◽  
Metal Ion Sensing

Synthesis and enhanced two-photon absorption properties of tetradonor-containing anthracene-centered 2-D cross-conjugated polymers

2011 ◽  
Vol 21 (11) ◽  
pp. 3916 ◽  
Author(s):  
Xiaojing Li ◽  
Xueheng Zhang ◽  
Wen Li ◽  
Yalong Wang ◽  
Tongliang Liu ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon

New Kind of Hyperbranched Conjugated Polymers Containing Alkyl-Modified 2,4,6-Tris(thiophen-2-yl)-1,3,5-triazine Unit for Enhancing Two-Photon Absorption

2014 ◽  
Vol 47 (19) ◽  
pp. 6679-6686 ◽  
Author(s):  
Pengcheng Zhou ◽  
Cheng Zhong ◽  
Xingguo Chen ◽  
Jingui Qin ◽  
Inês Mariz ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Photon Absorption ◽  
Two Photon Absorption ◽  
Two Photon

Conjugated Polymers with Pyrrole as the Conjugated Bridge: Synthesis, Characterization, and Two-Photon Absorption Properties

2011 ◽  
Vol 115 (27) ◽  
pp. 8679-8685 ◽  
Author(s):  
Qianqian Li ◽  
Cheng Zhong ◽  
Jing Huang ◽  
Zhenli Huang ◽  
Zhiguo Pei ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Photon Absorption ◽  
Absorption Properties ◽  
Two Photon Absorption ◽  
Two Photon
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