Synthesis and characterization of carbazole derived nonlinear optical dyes

Three kinds of carbazole derived dyes, Caz-MN, Caz-Fu, and Caz-Vm-MN of push-pull molecules were synthesized and their nonlinear optical properties measured. The second harmonic generation (SHG) coefficients, d(33), of Caz-Fu/PVK[poly(9-vinylcarbazole)] (0.1:0.9) and Caz-Vm-MN/PVK (0.1:0.9) were 2.06 x 10(-9) esu and 7.3 x 10(-9) esu, respectively. The electro-optic coefficients (r(33)) of these PVK blends with dyes were also observed to be 1.23 pm/V, 4.03 pm/V at a wavelength of 632.8 nm. The synthesized novel carbazole based dyes Caz-MN, Caz-Fu, and Caz-Vm-MN were characterized by means of H-1 NMR spectroscopy, IR spectroscopy, thermogravimetric analysis, electro-optic coefficients (r(33)), and their NLO properties were evaluated by Maker fringe method. (c) 2006 Elsevier Ltd. All rights reserved.