Nanoelectronics Laboratory, University of Cincinnati, Cincinnati, OH 45221-0030, USA.
Nanotechnology. 2014 Mar 7;25(9):094012. doi: 10.1088/0957-4484/25/9/094012. Epub 2014 Feb 12.
Organic light-emitting diodes (OLED) were fabricated on flexible and transparent reconstituted cellulose obtained from wood pulp. Cellulose is naturally available, abundant, and biodegradable and offers a unique substrate alternative for the fabrication of flexible OLEDs. Transparent cellulose material was formed by dissolution of cellulose in an organic solvent (dimethyl acetamide) at elevated temperature (165 °C) in the presence of a salt (LiCl). The optical transmission of 40-μm thick transparent cellulose sheet averaged 85% over the visible spectrum. High brightness and high efficiency thin film OLEDs were fabricated on transparent cellulose films using phosphorescent Ir(ppy)3 as the emitter material. The OLEDs achieved current and luminous emission efficiencies as high as 47 cd A(-1) and 20 lm W(-1), respectively, and a maximum brightness of 10,000 cd m(-2).
有机发光二极管（OLED）是在由木浆制成的柔性透明再造纤维素上制造的。纤维素是天然存在的、丰富的、可生物降解的，为制造柔性 OLED 提供了独特的基板替代品。透明纤维素材料是通过将纤维素在有机溶剂（二甲基乙酰胺）中溶解在高温（165°C）下形成的，同时存在盐（LiCl）。40-μm 厚的透明纤维素片的光学透过率在可见光谱范围内平均为 85%。在透明纤维素薄膜上使用磷光 Ir(ppy)3 作为发射材料制造了高亮度和高效率的薄膜 OLED。OLED 的电流和光发射效率分别高达 47 cd A(-1)和 20 lm W(-1)，最大亮度为 10,000 cd m(-2)。
