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This work demonstrates the spectral and amplified spontaneous emission (ASE) properties of a new chalcone laser dye material of 1-phenyl-3-[4-(1-pyrrolidinyl) phenyl]-(2E)-propen-1-one (4-Pone) for the first time. The absorption, fluorescence, Stokes’ shift and quantum yield were obtained using different organic solvents. The energy band gap was ca...
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This paper includes the efficacy of synthesis and characterization of a new liquid laser dye material – chalcone of 1-(4-methylsulfonyl phenyl)-3-(4-N,N-dimethyl (amino phenyl)-2-propen-1-one (MSPPP) and its application as a new laser medium. The absorption and fluorescence spectra of MSPPP were investigated under different solvents and concentrati...
Citations
The paper reveals the spectrum and amplified spontaneous emission (ASE) features of a new Chalcone laser dye material of 1-(4-methylsulfonyl phenyl)-3-(4-N, N dimethyl amino phenyl)-2-propen-1-one (MSPPP) with the molecular formula C 18 H 19 NO 3 S. The absorption, fluorescence, Stokes’ shift, and quantum yield were obtained using different organic solvents. The energy band gap was calculated and compared with that of 3-[4-(dimethylamino) phenyl]-1-phenyl-(2E)-propen- 1-one (DAPPP). Under suitable concentrations and pump power excitation (Nd: YAG laser 355 nm), MSPPP produced an intense ASE at 522.5 nm. Previously, we had reported that DAPPP showed optical activities that were significantly better than that of coumarin 503. The absorption spectra of MSPPP showed a wavelength band in the range 403–427 nm, whereas the fluorescence spectra exhibited a band at 472–533 nm. ASE was observed under pump pulse laser excitation, and the wavelengths were attuned from 511 to 548 nm. The molecular geometry was optimized, and their HOMO-LUMO energy values were determined by SCM Software for Chemistry & Materials using the DFTB (GGA BLYP) [Density-Functional-Based Tight-Binding] method.
In this work, we investigate the effects of titanium dioxide (TiO 2 ) nanoparticle percentages on the optical and electrical properties of 3-(4-(dimethyl-amino)phenyl)-1-phenyl-(2E)-propen-1-one (DAAP). In order to achieve thin films, DAAP was dissolved in acetone and doped with different ratios of TiO 2 . The pure and composite mixtures were spin-coated onto a glass substrate. We investigated the influence of TiO 2 on XRD patterns, absorption, energy band gaps, refractive indices, sheet resistance, resistivity, and Hall coefficients. We used the XRD technique to study the structure of DAAP pre- and post-doping with TiO 2 nanoparticles. It was evident from the XRD patterns that the composite transformed from an amorphous to a polycrystalline nature and behaved similarly to titanium oxide crystals. The pure sample exhibited an absorption band of 409 nm. With the addition of TiO 2 , the whole absorption spectrum shifted to the blue region. For example, with a dopant percentage of 15%, the spectrum shifted to a wavelength of 368 nm. The energy band gap values increased with a dopant concentration from 2.65 eV of pure DAAP to 2.91 eV of maximum dopant percentage (15%). The refractive index decreased to its lowest value of 2.47 with the increase in TiO 2 concentration. The impact of increasing TiO 2 percentage highly improved electrical characteristics by reducing the sheet resistance and resistivity to 905 k(Ω/sq) and 230 k on the (Ω · cm), respectively. An optimized DAAP doped with 15% TiO 2 has been used as an n -type layer on a p -type monocrystalline silicon wafer (Si (111)) to fabricate η = 0.23% efficient solar cells. On the other hand, the amplified spontaneous emission (ASE) of the DAAP and dopant mixture was excited by the third harmonic generation ( λ ex = 355 nm). The pure DAAP exhibits an ASE peak at 535 nm. The intensity decreased rapidly with increased dopant concentration, whereas the full width at half-maximum (FWHM) increased slightly.
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.
