Low‐cost light management films that completely originate from natural polymers for biodegradable optoelectronics are a growing trend with great demand in the near future, for example, highly transparent and hazy films. Herein, a novel green method simply based on the solubility difference between cellulose and chitosan in ionic liquid is proposed to cast all‐polysaccharide transparent films with customized transmission haze. The dissolved cellulose in 1‐Allyl‐3‐methylimidazolium chloride (AmimCl) ionic liquid serves as matrix. The insoluble chitosan is deliberately dispersed in the matrix, which can maintain its original particle size due to its poor solubility in AmimCl and can significantly increase the surface roughness of the composite film and hence functions as the light scatterer. Eventually, an all‐polysaccharide composite film (Cel/CS) with high transmittance (>84.8%) and tunable haze (10–93%) is prepared using different coagulating bath and drying methods. The film is highly suitable for large‐scale continuous production and sufficient to satisfy the varying haze requirements of different applications, including flexible lighting and displays, antireflection and anti‐glare coatings, and privacy protection.

中文翻译：

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高度透明的全多糖复合薄膜，具有可调节的透光度，可进行光处理

完全源自天然聚合物的可生物降解光电电子的低成本光控膜是一种增长趋势，在不久的将来需求很大，例如，高度透明和朦胧的膜。在此，提出了一种仅基于纤维素和壳聚糖在离子液体中的溶解度差异的新型绿色方法，以流延定做的雾状流延全多糖透明薄膜。溶于1-烯丙基-3-甲基咪唑鎓氯化物（AmimCl）离子液体中的纤维素用作基质。不溶性壳聚糖故意分散在基质中，由于其在AmimCl中的溶解性差，可以保持其原始粒径，并且可以显着增加复合膜的表面粗糙度，因此可以用作光散射体。最终，使用不同的凝固浴和干燥方法制备了具有高透射率（> 84.8％）和可调雾度（10-93％）的全多糖复合膜（Cel / CS）。该膜非常适合大规模连续生产，并足以满足不同应用的各种雾度要求，包括柔性照明和显示，防反射和防眩光涂层以及隐私保护。