Preparation of an Inorganic All-Solid-State Electrochromic Device with Excellent Open-Circuit Memory

Area of Science:

• Materials Science
• Electrochemistry
• Solid-State Devices

Background:

• Current electrochromic devices (ECDs) suffer from self-bleaching due to cation transport and redox reactions.
• This limits their use in applications requiring long-term open-circuit memory, such as static displays.

Purpose of the Study:

• To inhibit self-bleaching in ECDs by controlling cation transport.
• To enhance the open-circuit memory of ECDs for static display applications.

Main Methods:

• Utilized phosphate glass as an electrolyte to create high-energy barriers for ion transport.
• Engineered a mechanism where sodium ions become conductive upon heating and frozen upon cooling.
• Developed inorganic all-solid-state ECDs incorporating this thermal-ionic gating mechanism.

Main Results:

• The phosphate glass electrolyte effectively suppressed cation transport and redox reactions, preventing self-bleaching.
• The ECDs demonstrated electrochromism when heated and colored, with coloration maintained for months after cooling.
• Achieved significantly improved open-circuit memory compared to conventional ECDs.

Conclusions:

• Phosphate glass electrolytes can be used to construct ECDs with excellent open-circuit memory.
• The thermal-ionic gating mechanism effectively inhibits self-bleaching by controlling ion mobility.
• This advancement enables robust ECDs suitable for static display advertisement applications.