Ultra-fast photoluminescence dynamics process based on CsPbBr₃ perovskite microspheres

Area of Science:

• Materials Science
• Optoelectronics
• Photonics

Background:

• Perovskite materials offer excellent optoelectronic properties for micro-/nano-scale light sources.
• Optical microcavities enhance light-matter interactions, leading to strong and ultrafast stimulated emission.
• Temporal control of stimulated emission in these systems is an underexplored area.

Purpose of the Study:

• To investigate the ultrafast photoluminescence dynamics of CsPbBr₃ perovskite microspheres.
• To reveal the dependence of stimulated photoluminescence timing on excitation intensity.
• To demonstrate a method for modulating ultrafast light pulses.

Main Methods:

• Utilized CsPbBr₃ perovskite microspheres.
• Employed streak camera technology to observe photoluminescence dynamics.
• Used a simplified rate equation model for interpretation.

Main Results:

• Demonstrated a clear dependence of the strongest stimulated photoluminescence timing on excitation intensity.
• Observed that increasing pump fluence can advance or delay emission by picoseconds.
• Interpreted tunability via carrier density, optical gain, and microcavity mode shifts.

Conclusions:

• Excitation intensity provides a practical and precise method for modulating ultrafast light pulses.
• Findings offer possibilities for designing compact optical modulators.
• Potential for developing high-speed photonic devices based on perovskite microspheres.