Synthesis of novel pyrrolidinyl chalcone derivatives: Spectral properties, energy band-gap tailoring, and amplified spontaneous emission

Abstract

This work demonstrates the synthesis, structural features, and spectral properties of novel 3-(4-(pyrrolidinyl) phenyl)-1-(4,3 di-substituted phenyl)-(2E)-propen-1-one chalcone derivatives. Their absorption, fluorescence, NMR spectra, influence of functional groups, energy band gaps, Stokes shift, and amplified spontaneous emission (ASE) are thoroughly studied. The band gaps of these chalcones are significantly lowered by adding electron-donating groups. In contrast, the electron-withdrawing groups lead to decreasing the energy band gap value. When the pyrrolidinyl group is replaced with N, N-dimethylamino group, the energy gap value decreases. The effect of functional groups (altering the pyrrolidinyl by N, N dimethylamino) red-shifts the ASE spectra to longer wavelengths. Under a suitable pump power energy excitation and concentration, these chalcones exhibit a wide range of ASE spectra.