High-Efficiency Organic Mechanophosphorescence from A Phenoselenazine Phosphor for Multiple Applications

Area of Science:

• Materials Science
• Organic Electronics
• Photophysics

Background:

• Mechanoluminescence (ML) materials are crucial for pressure sensing and damage detection.
• Existing mechanophosphorescence (MP) materials have limitations in luminescence efficiency and brightness.

Purpose of the Study:

• To develop a highly efficient organic mechanophosphorescence material.
• To explore applications in pressure-sensitive displays and ultrasound-induced luminescence.

Main Methods:

• Synthesis and characterization of a novel piezoelectric material, p-BPM.
• Fabrication of a display device using p-BPM crystals.
• Investigation of ultrasound-induced luminescence.
• Creation and testing of composite films with PBAT polymer.

Main Results:

• p-BPM achieved a record 61.4% phosphorescence efficiency, the highest for pure organic MP materials.
• A functional pressure-sensitive display device was demonstrated.
• Bright ultrasound-induced luminescence was observed at 40 kHz.
• Composite films showed good tensile strength and piezoelectric energy harvesting (0.47 V open-circuit voltage).

Conclusions:

• p-BPM represents a significant advancement in highly efficient organic MP materials.
• The material shows promise for stress monitoring, imaging, and marine robotics.
• This work paves the way for next-generation ML-based technologies.