Lasing in Two-Dimensional Tin Perovskites

Area of Science:

• Materials Science
• Optics
• Solid-State Physics

Background:

• Two-dimensional (2D) perovskites offer potential for enhanced stability and efficiency over 3D counterparts.
• Despite interest in photonic applications, lasing in 2D perovskites remains under-explored and debated.
• Luminescent properties of 2D perovskites have not consistently met expectations.

Purpose of the Study:

• To improve optical gain properties in 2D perovskites.
• To achieve optically pumped lasing in 2D perovskite materials.
• To investigate the influence of spacer cations on defectivity, photostability, and optical gain.

Main Methods:

• Developing a synthetic strategy for high-crystallinity PEA2SnI4 films.
• Evaluating optical gain properties through amplified spontaneous emission (ASE) measurements.
• Characterizing the impact of spacer cation selection on material properties.

Main Results:

• Achieved optically pumped lasing in 2D perovskites.
• Demonstrated that spacer cation choice significantly affects defectivity and photostability.
• Obtained PEA2SnI4 films with high crystallinity and favorable optical properties.
• Reported a low ASE threshold of 30 μJ/cm² and high optical gain (>4000 cm⁻¹ at 77 K).
• Showcased ASE operation extending to room temperature.

Conclusions:

• The choice of spacer cation is critical for optimizing 2D perovskite optical gain and photostability.
• The developed synthetic strategy enables high-performance 2D perovskite materials for photonic applications.
• Optically pumped lasing in 2D perovskites is achievable and tunable through material design.