Rapid synthesis of new fluorene-based conjugated polymers P1-P8 is reported by polymerization of polyphenylene-substituted dendronized monomer 2,7-dibromo-9,9-di(4-(2,3,4,5-tetraphenylphenyl)-benzyl) fluorene (M1) and 2,7-dibromo-9,9-di(4-pentaphenylphenyl)-benzyl) fluorene (M2) with different 9,9-disubstituted 2,7-dibromo fluorene monomers (M3-M6) under microwave irradiation. The structure of these synthesized polymers P1-P8 was established by FTIR, H-1 NMR, C-13 NMR, and gel permeation chromatography techniques. The photophysical studies of these polymers P1-P8 shows good results desirable for light-emitting material. These polymers exhibited UV-Vis absorption peak with the maxima in 344-386nm in THF solution. Similarly, the fluorescence spectra of these polymers showed PL maxima in 414-418nm with shoulder peak in 437-440nm. From this study, the stoke shifts was observed in 30-73nm, and quantum efficiency was found in 0.41-0.57. Polymers had thermal stability up to 200 degrees C; however, for dihexyl-substituted dendronized polymer, P1 and P5 showed thermal decomposition at 490 and 430 degrees C, respectively. In addition to this, polymers P1-P8 were also analyzed by electrochemical study in which the onset of the irreversible oxidation wave of dendronized polymers P1-P8 is recorded in the range of 0.88-0.99V. The results of these various studies showed that the synthesized polymers P1-P8 can be promising materials for blue-light-emitting diodes because of their high photoluminescence (PL), quantum efficiencies, and thermal stability.