Sensitive mechanical compression-patterned phosphorescence in the rubbery state of cross-linked polymer network

Area of Science:

• Polymer Science
• Materials Science
• Luminescence

Background:

• Molecular motion in polymers typically quenches phosphorescence above the glass transition temperature (Tg).
• Modulating phosphorescence at elevated temperatures remains a significant scientific challenge.

Purpose of the Study:

• To develop a polymer-based material with tunable, high-temperature phosphorescence.
• To investigate the impact of mechanical stress on phosphorescence in a cross-linked polymer network.

Main Methods:

• Dye-doped, cross-linked epoxy resins were synthesized.
• Mechanical compression and temperature variations were applied to study phosphorescence.
• The influence of free volume, mechanical force, and temperature on luminescence was analyzed.

Main Results:

• The material displayed visible, long-lived phosphorescence up to 150°C.
• Mechanical compression triggered reversible phosphorescence in the rubbery state at low stress (11 kPa).
• The material maintained consistent thermal-mechanical coupling over 12 cycles.

Conclusions:

• Cross-linked epoxy resins can be engineered for high-temperature phosphorescence applications.
• Tunable, mechanically responsive luminescence opens avenues for advanced sensing and data storage.
• The study provides a foundation for materials designed for extreme environments.