Responsible Perovskite Light‐Emitting Diodes Based on Cellulose Nanofibrillated Fiber Substrates

Abstract In this study, the development of perovskite light‐emitting diodes (PeLEDs) on biodegradable substrates is presented, with the aim of creating environmentally friendly portable devices. By using cellulose nanofibrillated fiber (CNF) as a bio‐based and biodegradable platform, the production of truly biodegradable, flexible, and high‐performance devices is enabled. The PeLEDs achieve a maximum luminance of 34 cd m − 2 , a current efficiency of 5.37 cd/ A −1 at a luminance of 8 cd m − 2 , and a power efficiency of 2.29 lm W −1 at 7 cd m − 2 . Additionally, highly stable perovskite layers are formed on the cellulose substrates, as the perovskite film experiences less strain on cellulose than on indium tin oxide. These findings underscore the potential of PeLEDs and suggest that biodegradable substrates can play a larger role in portable electronics than previously thought. This advancement opens the door to the development of sustainable portable devices that produce less persistent waste and help conserve valuable resources.