Nowadays, plasma treatments are one of the powerful techniques usually accomplished to change the surface characteristics of polymeric films. This study presents the influence of oxygen plasma irradiation on the structural and the optical properties of high-density polyethylene (HDPE) and polyethylene terephthalate (PET) films that will be used in optoelectronic devices. The films were irradiated with an oxygen plasma for duration of 3, 4.5, and 6 min. The surface structure of the films was investigated utilizing X-ray diffraction (XRD). For an irradiation time of 6 min, the crystallite size changes from 13.9 to 19.7 nm and from 5.7 to 6.5 nm for pristine HDPE and PET, respectively. The UV–Vis optical absorption spectrum demonstrates a slight shift in the absorption edge towards the visible region caused by the oxygen irradiation time for both the HDPE and the PET films. Increasing the irradiation time leads to a slight decrease in the optical energy band gap E_g and to an improvement in the carbon cluster number N. The results show clear improvements in the optical properties of HDPE and PET due to plasma irradiation that make them good candidates for use in optoelectronics applications.

如今，等离子体处理是通常用来改变聚合物薄膜表面特性的强大技术之一。本研究展示了氧等离子体辐照对将用于光电器件的高密度聚乙烯 (HDPE) 和聚对苯二甲酸乙二醇酯 (PET) 薄膜的结构和光学性能的影响。薄膜用氧等离子体照射 3、4.5 和 6 分钟。利用X射线衍射（XRD）研究薄膜的表面结构。对于 6 分钟的照射时间，原始 HDPE 和 PET 的微晶尺寸分别从 13.9 到 19.7 nm 和从 5.7 到 6.5 nm 变化。UV-Vis 光吸收光谱表明 HDPE 和 PET 薄膜的吸收边缘向可见光区域发生轻微偏移，这是由氧气照射时间引起的。增加照射时间导致光能带隙略有下降E _g和碳簇数N的改进。结果表明，由于等离子体照射，HDPE 和 PET 的光学特性得到明显改善，这使它们成为光电子应用的理想选择。