Organic light-emitting diodes (OLEDs) typically have broad emission spectra, and tuning of OLED emission is often required for use in displays, lighting, and biomedical applications. In this study, we investigate a facile and dynamic color-tuning approach for the fine-tuning of OLED emission by using the anisotropic property of squaraine dye as an external thin film filter. We compared the results of the proposed tuning method with conventional methods of emission tuning, using the microcavity effect and varying emissive layer thickness. Our experiments and optical simulations show that the anisotropic filtering effect, caused by graded absorption of the squaraine layer, effectively removes the tail emission at longer wavelengths and has the highest range of color tuning as compared to the conventional methods. Our results demonstrate the potential of anisotropic filters as a simple alternative method for OLED emission tuning.

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利用各向异性滤光片的有机发光二极管的简便而动态的色彩调节方法

有机发光二极管（OLED）通常具有较宽的发射光谱，并且在显示器，照明和生物医学应用中通常需要对OLED发射进行调整。在这项研究中，我们研究了利用方酸染料的各向异性特性作为外部薄膜滤光片，对OLED发射进行微调的一种简便而动态的颜色调整方法。我们使用微腔效应和变化的发射层厚度，将建议的调谐方法的结果与传统的发射调谐方法进行了比较。我们的实验和光学模拟结果表明，与方方法相比，由方酸层的渐变吸收引起的各向异性过滤效果可有效去除较长波长处的尾部发射，并具有最大的色彩调节范围。