The Optical and Photoluminescence Features of GdNiSe Material Synthesized Hydrothermally

In this study, the hydrothermal method was used to synthesize the gadolinium nickel selenide (GdNiSe) material. The materials' energy bandgaps ranged from ۱.۵۸ eV to ۱.۱۸ eV. Annealing the material led to a reduction in the energy band gap. The energy bandgap of GdNiSe was enhanced through the annealing process . The photoluminescence was carried out by exposing the materials to sunlight at different time intervals. The unannealed GdNiSe material was exposed to sunlight at ۲۰-minute intervals, ranging from ۰ to ۱۴۰ minutes. The prominent peaks were identified within the wavelength range of ۶۱۲ to ۶۶۱ nm. X-ray diffraction (XRD) analysis of the GdNiSe material has shown that it crystallizes in a hexagonal crystal structure with space group P۶۳/mmc. The lattice parameters of GdNiSe are a = ۰.۵۸۷۵ nm and c = ۱.۰۲۵۶ nm. The XRD patterns of GdNiSe material are affected by annealing. It impacts the intensity, position, and size of peaks, revealing details about the material's structure and microstructure. The FTIR spectra showed various peaks, such as ۲,۶۵۴, ۱,۸۶۹, ۱,۶۳۸, ۱,۱۰۵, and ۹۳۵ cm-۱. The GdNiSe material exhibits a strong covalent bond, leading to a short bond length and high bond strength. The overlapping of their ۳d and ۴p orbitals creates the bond between Ni and Se, resulting in a bond order of two.

کلیدواژه ها:

Absorbance ، Transmittance ، Energy bandgap ، Photoluminescence