Enhancing Mn-Activated Mechanoluminescence via Pressure-Regulated Local Structure in Centrosymmetric BaZnOS for...

Area of Science:

• Materials Science
• Solid State Physics
• Luminescence

Background:

• Self-recoverable mechanoluminescence (ML) is typically observed in non-centrosymmetric materials.
• Recent findings show ML in centrosymmetric systems like Mn-activated BaZnOS, but the mechanism is unclear.
• This lack of understanding hinders the development of high-performance optoelectronics.

Purpose of the Study:

• To investigate the mechanism and structure-luminescence relationship of Mn²⁺-activated BaZnOS.
• To demonstrate the self-recoverable piezoelectrically activated ML emission in Mn²⁺-activated BaZnOS.
• To explore the potential of this material for optoelectronic applications.

Main Methods:

• Experimental investigation of mechanoluminescence (ML) and photoluminescence (PL) under varying pressures.
• Analysis of pressure-regulated local structure, local piezoelectricity, and defect traps.
• Characterization of dynamic responses in temporal and spatial dimensions.

Main Results:

• Mn²⁺-activated BaZnOS shows strong, reproducible, self-recoverable piezoelectrically activated ML emission up to 1.5 GPa.
• ML exhibits oscillatory behavior at high compression rates (2.3-2.7 GPa s^-1).
• Distinct ML and PL behaviors are attributed to pressure-modulated local structures affecting piezoelectricity and defect traps.

Conclusions:

• The study clarifies the mechanism behind ML and PL in Mn²⁺-activated BaZnOS.
• Pressure-regulated local structure significantly influences material properties.
• Mn²⁺-activated BaZnOS demonstrates potential for diverse optoelectronic applications due to its dynamic responses.