Abstract: Optical physical properties of three new chromophores with triphenylamine as molecular frame-work bearing one,two,and three 4-(n-bytyloxy-styryl) group(s) at the periphery respectively,(named as T1,T2,and T3) have been investigated.It is interesting to find,on the one hand,that the relative fluorescence intensity is increased from T1 to T2 and to T3 in nonpolar solvents,but decreased from T1 to T2 and to T3 in polar solvents.On the other hand,fluorescence quantum yields for T1 is increased,while those for T3 is decreased with the increase of the solvent polarity,which means that there may exist two emission mechanism,i.e.ICT state and TICT state functioning in different solvents.Although the mole absorbance (ε) is increased monotonously from T1 to T2 and to T3 in any solvents used,maximum absorption wavelengths and corresponding absorption edge are red-shifted from T1 to T2 and to T3,however,the shift span for T3 is almost negligible,suggesting that the energy gap may remain unchanged when further dendritical structure is formed.

Key words: Trans-4-(4'-n-bytyloxy-styryl) triphenylamine, Trans-4,4-di(4'-n-bytyloxy-styryl) triphenylamine, Trans-4,4,4-tris(4'-butyloxy-styryl) triphenylamine, ICT emission, TICT emission