Abstract
Bistable display has been a long-awaited goal due to its zero energy cost when maintaining colored or colorless state and electrochromic material has been highly considered as a potential way to achieve bistable display due to its simple structure and possible manipulation. However, it is extremely challenging with insurmountable technical barriers related to traditional electrochromic mechanisms. Herein a prototype for bistable electronic billboard and reader with high energy efficiency is demonstrated with excellent bistability (decay 7% in an hour), reversibility (104 cycles), coloration efficiency (430 cm2 C−1) and very short voltage stimulation time (2 ms) for color switching, which greatly outperforms current products. This is achieved by stabilization of redox molecule via intermolecular ion transfer to the supramolecular bonded colorant and further stabilization of the electrochromic molecules in semi-solid media. This promising approach for ultra-energy-efficient display will promote the development of switching molecules, devices and applications in various fields of driving/navigation/industry as display to save energy.
Highlights
Bistable display has been a long-awaited goal due to its zero energy cost when maintaining colored or colorless state and electrochromic material has been highly considered as a potential way to achieve bistable display due to its simple structure and possible manipulation
We have tried to overcome these drawbacks through some different mechanisms such as bond-coupled electron transfer (BCET)[15] and realized excellent electrochromic properties; the stability of the device is to be improved for limited long-term stability of related molecules
The feasibility of electrochromism has been proved by the above tests, and the electrochromic mechanism is discussed
Summary
Bistable display has been a long-awaited goal due to its zero energy cost when maintaining colored or colorless state and electrochromic material has been highly considered as a potential way to achieve bistable display due to its simple structure and possible manipulation. A prototype for bistable electronic billboard and reader with high energy efficiency is demonstrated with excellent bistability (decay 7% in an hour), reversibility (104 cycles), coloration efficiency (430 cm[2] C−1) and very short voltage stimulation time (2 ms) for color switching, which greatly outperforms current products This is achieved by stabilization of redox molecule via intermolecular ion transfer to the supramolecular bonded colorant and further stabilization of the electrochromic molecules in semi-solid media. Charge repulsion, unstable radical, and/or higher energy state of redox-dyes associated with conventional electrochromic/e-ink pathways were avoided This process accompanied with proton-coupled electron transfer (PCET) broadens color selection with available pH dyes and improves redox species’ stability by avoiding reactive radicals. We investigated whether we can really demonstrate the feasibility of making a simple device with all properties for ideal bistable display
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