Synthesis and optical properties of soluble low bandgap poly (pyrrole methine) with alkoxyl substituent

doi:10.1007/s12200-015-0519-6

Front. Optoelectron.

2016, Vol. 9

Issue (1) : 99-105 https://doi.org/10.1007/s12200-015-0519-6

RESEARCH ARTICLE

Synthesis and optical properties of soluble low bandgap poly (pyrrole methine) with alkoxyl substituent

Baoming LI(

),Enkai PENG,Leilei YE,Zhiyin WU

College of Material Science and Engineering, Fuzhou University, Fuzhou 350108, China

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Abstract

A soluble low bandgap poly (pyrrole methine) with alkoxyl substituent, poly {(3-hexanoyl)pyrrole-[2,5-diyl(p-tetradecyloxybenzylidene)]} (PHPDTBE), was synthesized and characterized by ¹H nuclear magnetic resonance (¹H-NMR), Fourier transform- in frared (FT-IR), elemental analysis (EA) and gel permeation chromatography (GPC). PHPDTBE was readily soluble in weak polar organic solvents. The absorption peaks of PHPDTBE solution and film were located at around 458 and 484 nm, respectively. The optical bandgaps of PHPDTBE film for indirect allowed and direct allowed transitions were measured to be 1.66 and 2.35 eV, respectively. PHPDTBE film had few defects in the energy band and the Urbach energy of PHPDTBE film was calculated to be about 0.19 eV. The resonant third-order nonlinear optical susceptibilities of PHPDTBE solution and film measured by degenerate four-wave mixing (DFWM) technique at 532 nm were all in the order of 10^-8 esu, which was about 1~3 orders of magnitude larger than that of the other ordinary π-conjugation polymers.

Keywords poly (pyrrole methine) low bandgap Urbach energy third-order nonlinear optical property

Corresponding Author(s): Baoming LI

Just Accepted Date: 23 July 2015 Online First Date: 01 September 2015 Issue Date: 18 March 2016

Cite this article:

Baoming LI,Enkai PENG,Leilei YE, et al. Synthesis and optical properties of soluble low bandgap poly (pyrrole methine) with alkoxyl substituent[J]. Front. Optoelectron., 2016, 9(1): 99-105.

URL:

https://academic.hep.com.cn/foe/EN/10.1007/s12200-015-0519-6
https://academic.hep.com.cn/foe/EN/Y2016/V9/I1/99

Fig.1 Synthetic route to PHPDTBE and its intermediates

Tab.1 solubility of PHPDTBE in various solvents

Fig.2 UV-Visible absorption spectra of PHPDTBA solution, PHPDTBE solution and PHPDTBE film

Fig.3 Optical bandgap of PHPDTBE

Fig.4 Urbach energy of PHPDTBE

Fig.5 Schematic representation for experimental setup for the DFWM technique, where I_f, I_b, I_p and I_s were forward pump beam intensity, backward pump beam intensity, probe beam intensity and signal beam intensity, individually; S was the sample; α was the intersection angle of forward pump beam and probe beam, which was about 5°

Tab.2 Third-order NLO properties of PHPDTBE solution and film studied at 532 nm

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