Abstract

In this research, the solution casting technique has been used to synthesize composite with different weights of VCl₃ embedded in polyvinyl alcohol (PVA), in the form of films. X-ray diffraction (XRD) patterns display a broad peak with low intensity of high doping composite films, reflecting an increase in the non-crystallinity and the internal strain. The complex formation between the OH^– groups and the V³⁺ ions has been outlined through Fourier transform IR spectroscopy (FTIR). The film’s surface morphology via SEM images shows an increase in the agglomeration with the doping ratio of VCl₃. The optical band gap and the width of localized states were changed from 4.86 to 3.03 eV and 0.85 to 2.54 eV. The average refractive index was estimated from band gap energy, as it increased to 2.46 for a composite of high doping ratio (VPVA6). Moreover, the optical susceptibilities χ⁽¹⁾ and χ⁽³⁾ and the non-linear refractive index n⁽²⁾ values indicate the possibility of applying this novel composite material on a wide scale of optoelectronic applications. The samples have reduced the power of the two lasers (632.8 and 532 nm) to 25 and 21%. The AC electrical conductivity was increased with doping ratio, and its relation with frequency is following Jounscher’s law. The improved characteristics, optical performance, and low band gap make them promising in UV-protector and linear/non-linear optoelectronic instruments.

中文翻译：

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氯化钒浸渍聚乙烯醇复合材料作为高效的线性，非线性和限制性光学应用：微观结构，电学和光学性质

摘要

在这项研究中，溶液浇铸技术已被用来合成具有不同重量的VCl _3的复合材料，该复合材料以薄膜形式嵌入聚乙烯醇（PVA）中。X射线衍射（XRD）图案在高掺杂复合膜强度较低的情况下显示出较宽的峰，反映出非晶态性和内部应变的增加。的OH之间的复合物的形成^-基团和V ³⁺离子已经通过傅立叶变换概述红外光谱（FTIR）。通过SEM图像观察薄膜的表面形貌表明，随着VCl ₃掺杂比例的增加，团聚现象增加。。光学带隙和局部态的宽度从4.86变为3.03 eV，从0.85变为2.54 eV。从带隙能量估计平均折射率，对于高掺杂比的复合材料（VPVA6），平均折射率增加到2.46。此外，光学磁化率χ ^（1）和χ ^（3）和非线性折射率n ^（2）值表明了将这种新型复合材料广泛应用于光电应用的可能性。样品已将两个激光器（632.8和532 nm）的功率降低到25％和21％。交流电导率随掺杂比的增加而增加，其与频率的关系遵循Jounscher定律。改进的特性，光学性能和低带隙使其在紫外线保护器和线性/非线性光电仪器中很有前途。