Study of absorption spectra of organic light emitting materials (triphenylderivatives of amine): A quantum mechanical study

Density Functional theory (DFT) is used to study the effect of substituents on the electronic and optical property of organic light emitting material 1,3,5-tris(4’-(1’’- phenyl-benzimidazol-2’’- yl)phenyl) amine (TPBB) and its derivatives (MeO-TPBB, Br-TPBB and Bu-TPBB ). TD – DFT has been used to study the absorption spectra of these molecules. This study suggests that each derivative of TPBB shows a UV – VIS spectra at slightly different frequency.