Abstract
Two novel hyperbranched donor–acceptor polyfluorenes based on 1,3,6,8-tertsubstituted carbazole core (4BrCzP1 and 4BrCzP2) were synthesized and characterized. The third order nonlinear optical properties of the materials were studied using Z-scan technique with femtosecond Ti: sapphire laser with delivering pulses of 140fs at 800nm. The nonlinear optical refractive index was 9.29×10−8esu for 4BrCzP1 and 3.19×10−7esu for 4BrCzP2, respectively. While the third order nonlinear susceptibility was 1.29×10−9esu for 4BrCzP1 and 4.33×10−9esu for 4BrCzP2, respectively. The experimental results indicated that the hyperbranched polyfluorenes was a promising candidate in the application of third order nonlinear optical materials.
Published Version
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