الفهرس 
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Abstract
Study the effect of different solvents on the electronic absorption and fluorescence spectra of 2-(4-Biphenylyl)-6-phenylbenzoxazol (PBBO) and N-Ethyl-N-(2-hydroxyethyl)-4-(4-nitrophenylazo) aniline (dispersed red 1 (DR1)). The singlet state excited and ground dipole moments were evaluated from the equations of Lippert-Mataga and Billot. The detected singlet state excited dipole moments were found to be larger than the ground‐state ones. Moreover, the effect of silver nanoparticles on the emission spectrum of PBBO and DR1 has been observed. The energy transfer between PBBO and DR1 with some laser dyes will be studied in addition to some parameters, including the determination of the critical transfer distance (R0) and the evaluation of the energy transfer rate constant (kET). The theoretical absorption spectra of PBBO and DR1 compounds are calculated using Density function theory (DFT) calculations. In addition, the energy gap (Eg), bond length, and IR spectrum are carried out too.