College of Material Science and Engineering, Fuzhou University, Fuzhou 350108, China
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-infrared (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.
poly (pyrrole methine) poly (pyrrole methine) low bandgap low bandgap Urbach Urbach energy third-order nonlinear optical property Frontiers of Optoelectronics
2016, 9(1): 99
1 Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
2 State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian National Laboratory of Clean Energy, Dalian 116023, China
Frontiers of Optoelectronics
2013, 6(4): 418
