In this work, we report on the diverse optical parameters of Mn₂O₃ thin films prepared by nebulized spray pyrolysis technique by the effect of spray solution concentration. X-ray diffraction study confirmed the Mn₂O₃ films belong to cubic structure. The Raman vibrational band observed at 636 cm⁻¹ is related with the symmetric stretching of Mn–O bond of trivalent manganese ions (Mn³⁺). The surface morphological study showed that the nano-sized particles are homogenously distributed on the film surface. The films exhibit the highest transmittance in the near infrared region. The spray solution concentration induced reduction of Urbach energy (from 677 to 655 meV) indicates the decrease in degree of crystal defects in the film. The extinction coefficient of the film was obtained in the order of 10⁻². It was observed that the optical dispersion threshold point (T_ODT) of Mn₂O₃ thin film is coincides with the refractive index threshold wavelength (λ_rtw) of the material. This was further corroborated from the intersection of phase velocity and group velocity curves at the point of λ_rtw or T_ODT. This indicates that no optical dispersion was taken place at that point and therefore the phase velocity is equal to the group velocity. The possible correlations among the data were made with the light of underlying concepts.

在这项工作中，我们通过喷雾溶液浓度的影响报告了通过雾化喷雾热解技术制备的 Mn ₂ O ₃薄膜的不同光学参数。X射线衍射研究证实Mn ₂ O ₃薄膜属于立方结构。在 636 cm ^-1处观察到的拉曼振动带与三价锰离子 (Mn ³⁺）。表面形态研究表明纳米级颗粒均匀分布在薄膜表面。这些薄膜在近红外区域表现出最高的透射率。喷雾溶液浓度引起的 Urbach 能量降低（从 677 到 655 meV）表明薄膜中晶体缺陷程度的降低。以10 ^-2的数量级获得膜的消光系数。观察到Mn ₂ O ₃薄膜的光色散阈值点(T _ODT )与材料的折射率阈值波长(λ _rtw )重合。λ 点处的相速度和群速度曲线的交点进一步证实了这一点_rtw或 T _ODT。这表明在该点没有发生光色散，因此相速度等于群速度。数据之间可能的相关性是根据基本概念进行的。