Temperature-Dependent Electrochromic Devices for Energy-Saving Dual-Mode Displays.

Area of Science:

• Materials Science
• Energy Storage and Conversion
• Optoelectronics

Background:

• Electrochromic (EC) devices are crucial for energy-efficient and sustainable technologies.
• Integrating multifunctionality is essential for EC devices to adapt to diverse environmental conditions.
• Developing EC devices with stable performance across wide temperature ranges remains a challenge.

Purpose of the Study:

• To demonstrate a novel dual-mode, temperature-dependent EC device.
• To investigate the mechanism behind the temperature dependence of EC device performance.
• To explore the device's potential for applications in varying light and temperature conditions.

Main Methods:

• Fabrication of a dual-mode EC device using a transparent PVA/EG-ZnCl2 organohydrogel electrolyte.
• Testing EC performance across a wide temperature range (-40 to 40 °C).
• Exploring and simulating ion/electron transport kinetics to understand temperature effects.
• Integrating a perovskite quantum dot photoluminescence film for dual display modes.

Main Results:

• The EC device exhibited good performance over a wide temperature range (-40 to 40 °C).
• The optimized tungsten oxide-based device showed high transmittance modulation (80.8% @660 nm) and excellent optical memory (97.3% retention after 32 h) at -40 °C.
• The device successfully switched between emissive and reflective display modes.

Conclusions:

• This work presents the first dual-mode, temperature-dependent EC device.
• The device demonstrates robust performance in extreme cold and offers dual functionality for varied lighting conditions.
• The findings indicate broad application prospects for EC devices in diverse environments.