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Polymers 2017, 9, 626 7 of 15 and optoelectronics applications. Utilization of natural dye is the novelty of this study in comparison to previous studies of other researchers. Furthermore, the intensity of the peak (3.460) is higher than Polymers 2017, 9, 626 7 of 15 those reported in previous studies for dye-doped PMMA polymer. Previous studies have confirmed thPerpervoiomuisinsgturdoilesofhdayve-dcoopnefdirmpoeldymtehrefilpmrosmfoirsienrgasarbole/roefwrdityaeb-ldeooppedticapl odliysmcse,rdefvilemlospefdorby opetriacsaalbdlae/traeswyrsiteambles. oAptciocanlsidiesrcas,bldeenvuelmopbedr obfypoatpetnictaslhdaavtea rseypsotertmeds. tAheconmsibdienratbiolensnuomf pboelrymofer patents have reported the combinations of polymer and dye for optical data storage [38]. and dye for optical data storage [38]. 5 4.5 4 3.5 3 2.5 2 1.5 1 0.5 0 190 290 390 490 590 690 wavelength (nm) 790 n σ* π π* GT 0 GT 14 GT 28 n π∗ Figure 5. The absorption spectra of pure PMMA and PMMA doped samples. Figure 5. The absorption spectra of pure PMMA and PMMA doped samples. 3 2.5 2 1.5 1 0.5 0 590 610 630 650 670 690 wavelength (nm) 710 730 750 GT 0 GT 14 GT 28 Distinguishable absorption peak at 670 nm Figure 6. The absorption spectra of pure PMMA and PMMA doped samples at longer wavelengths. Figure 6. The absorption spectra of pure PMMA and PMMA doped samples at longer wavelengths. Figure 7 represents the absorption coefficient variation with photon energy for the pure and Figure 7 represents the absorption coefficient variation with photon energy for the pure and doped PMMA samples. The absorption edge investigation is found to be significant in interpreting doped PMMA samples. The absorption edge investigation is found to be significant in interpreting the novel changes that occur in the electronic structure of doped materials [39]. It is obvious from the the novel changes that occur in the electronic structure of doped materials [39]. It is obvious from spectra that, upon addition of extracted GT solutions to the pure PMMA sample, the absorption edge the spectra that, upon addition of extracted GT solutions to the pure PMMA sample, the absorption are shifted towards lower photon energy sides. The absorption edge is a region in which an electron edge are shifted towards lower photon energy sides. The absorption edge is a region in which an is excited, from a lower energy state to a higher energy state, by an incident photon. The optical electron is excited, from a lower energy state to a higher energy state, by an incident photon. The absorption coefficient has been obtained from the transmittance and reflectance spectra of the films optical absorption coefficient has been obtained from the transmittance and reflectance spectra of the by applying the following relationship [40]: films by applying the following relationship [40]: where t, T, and R are the thickness, transmittance, and reflectance of the sample, respectively. The presence of the slow rising of the absorption coefficient with applying photon energies indicates the amorphous nature of the samples [41]. The estimated values of the absorption edge for the samples = 1 ln 1− (1) (1) α=1ln T t (1−R)2 Absorption (a.u) Absorption (a.u)PDF Image | Green Chemistry Fabricate Small Band Gap Polymers
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