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All Organic NLO Sol‐Gel Material Containing a One‐Dimensional Carbazole Chromophore
Author(s) -
Kuo WenJang,
Hsiue GingHo,
Jeng RuJong
Publication year - 2001
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/1521-3935(20010601)202:9<1782::aid-macp1782>3.0.co;2-o
Subject(s) - carbazole , poling , chromophore , materials science , thermal stability , polymer , photorefractive effect , second harmonic generation , knoevenagel condensation , polymer chemistry , prepolymer , chemical engineering , optoelectronics , chemistry , photochemistry , composite material , organic chemistry , optics , laser , physics , dielectric , polyurethane , engineering , catalysis , ferroelectricity
A NLO‐active polymer has been developed via combining chromophoric photorefractive characteristics and film optical quality of melamine network. A carbazole‐containing NLO‐phore can be acquired via a facile synthetic route, namely Knoevenagel condensation. Guest‐host prepolymer was obtained by doping the chromophores into benzoguanamine matrix. After poling and curing process, a NLO‐active organic sol‐gel material with large second‐order nonlinearity and excellent optical quality film has been achieved. Thermal stability of the polymer was analyzed via DSC and TGA. UV‐vis spectra and second harmonic generation measurement were utilized to characterize the linear and nonlinear optical properties. Reorientation dynamic stability was used to study temperature dependence of NLO signal. The d 33 and d 31 values for the polymer are 19 pm/V and 9 pm/V, respectively. Long‐term NLO stability was investigated by measuring effective second harmonic (SH) coefficient as a function of time. The effective SH coefficient retained 47% of its original value and leveled off after 10 h of thermal ageing at 80°C.