ZnO薄膜光谱计算与颜色预测

Spectrum Calculation and Color Prediction of ZnO Film

简述了色彩形成的物理过程,建立一较有效的材料光谱特性仿真与色彩预测模型。采用密度泛函理论,计算了纤锌矿ZnO的复折射率,计算结果与实验结果相符。计算并分析了ZnO薄膜的反射光谱性质,预测了ZnO薄膜颜色为黄色,与实际样品相符。研究了薄膜厚度对ZnO薄膜色彩的影响,结果表明,在相干长度范围内(<1 300 nm),膜厚对ZnO薄膜颜色调制作用显著,膜较厚时(>1 300 nm),色彩及明度趋于稳定。

The physical process of color formation is described and an effective model is built for materials＇ optical properties simulation and color prediction. By means of density functional theory, the complex refractive index of wurtzite ZnO is calculated and the results are consistent with the experimental results. Based on the calculation and analysis of the reflectance spectrum of ZnO thin films, predicts that the color of ZnO thin films are tend to be yellow, also in line with the actual sample. The effect of film thickness on ZnO color is studied. The results show that the thickness of ZnO film at the coherence length range （〈1 300 rim） has a significant impact on the color modulation, and the color and brightness are tend to be stable when the film is thick enough （〉1 300 nm）.