Abstract A solution casting process has been used to produce PAV/PEG/EY blend polymer composite films with different PEG concentrations. The structure and morphological of PAV/PEG/EY blend composite film have been characterized by XRD, TGA, FT-IR, TEM,SEM, EDAX and the UV–vis spectra were used to investigate the optical properties. The absorption spectra show a critical change in absorbance around (λ = 580 nm, photon energy = 2.13ev), which corresponds to the energy gap of the blend. The same behavior of refractive index, n, the extinction coefficient k and dispersion parameters were noticed. Optical energy band gap using Kubelka–Munk coordinate was estimated for direct and indirect allowed transitions, which was found to be 2.58eV for direct transition and 2.47 for indirect transition. The real and imaginary parts of the dielectric constant, er and ei are quite consistent with the absorption spectra and show a sharp change around λ = 560 with photon energy = 2.21 eV and corresponds to the average energy gap of the blend. The optical conductivity, σopt, was sharply changed at the same value of wavelength. With increasing PEG content in the of PVA/PEG/EY composite samples films, the emission peaks regarding the photoluminescence and fluorescence properties are red shifted, with the highest emission occurred at wavelengths ranges from λ em = 553 t o 575 n m .These values are very close to the energy gap values founded earlier in this work.

中文翻译：

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聚合物共混物 PVA/PEG 薄膜掺杂伊红 Y (EY) 染料的合成、表征、光学和光致发光特性

摘要 溶液浇铸工艺已被用于生产具有不同 PEG 浓度的 PAV/PEG/EY 共混聚合物复合膜。PAV/PEG/EY 共混复合薄膜的结构和形态已通过 XRD、TGA、FT-IR、TEM、SEM、EDAX 和紫外可见光谱进行了表征，用于研究光学性能。吸收光谱显示在（λ = 580 nm，光子能量 = 2.13ev）附近的吸光度发生了临界变化，这对应于混合物的能隙。注意到折射率 n、消光系数 k 和色散参数的相同行为。使用 Kubelka-Munk 坐标估计允许的直接和间接跃迁的光能带隙，发现直接跃迁为 2.58eV，间接跃迁为 2.47。介电常数的实部和虚部，er 和 ei 与吸收光谱非常一致，并在 λ = 560 附近显示急剧变化，光子能量 = 2.21 eV，对应于混合物的平均能隙。在相同的波长值下，光导率 σopt 急剧变化。随着 PVA/PEG/EY 复合样品薄膜中 PEG 含量的增加，关于光致发光和荧光特性的发射峰发生红移，最高发射发生在波长范围从 λ em = 553 到 575 nm 。这些值非常接近在这项工作中早期建立的能隙值。在相同的波长值下急剧变化。随着 PVA/PEG/EY 复合样品薄膜中 PEG 含量的增加，关于光致发光和荧光特性的发射峰发生红移，最高发射发生在波长范围从 λ em = 553 到 575 nm 。这些值非常接近在这项工作中早期建立的能隙值。在相同的波长值下急剧变化。随着 PVA/PEG/EY 复合样品薄膜中 PEG 含量的增加，关于光致发光和荧光特性的发射峰发生红移，最高发射发生在波长范围从 λ em = 553 到 575 nm 。这些值非常接近在这项工作中早期建立的能隙值。