Single-crystal CsPbBr₃-based vertical cavity surface emitting laser

Area of Science:

• Materials Science
• Optoelectronics
• Photonics

Background:

• All-inorganic perovskites exhibit excellent optoelectronic properties for devices like lasers, LEDs, and solar cells.
• High-quality single crystals are crucial for enhancing device performance.
• Vertical cavity surface emitting lasers (VCSELs) are key components in optical communication and sensing.

Purpose of the Study:

• To present a high-performance VCSEL utilizing a single-crystal CsPbBr₃ microplatelet.
• To demonstrate a simple solution-based fabrication method for perovskite single-crystal devices.
• To investigate the lasing characteristics and dynamics of the fabricated VCSEL.

Main Methods:

• Fabrication of a VCSEL by sandwiching a single-crystal CsPbBr₃ microplatelet between two distributed Bragg reflectors (DBRs) using a solution process.
• Characterization of lasing performance, including threshold, mode, and Q-factor.
• Time-resolved photoluminescence (TRPL) measurements using a streak camera to analyze lasing dynamics.

Main Results:

• Achieved single-mode lasing at 542 nm from the CsPbBr₃ VCSEL.
• Demonstrated a low lasing threshold of 5 µJ/cm².
• Obtained a high Q-factor of 2893 and observed picosecond-scale lasing dynamics via TRPL.

Conclusions:

• A novel and effective approach for fabricating high-performance laser devices using perovskite single-crystal microplatelets has been presented.
• The developed CsPbBr₃ VCSEL shows significant potential for applications requiring efficient and stable light emission.
• This work highlights the promise of single-crystal perovskites in advancing optoelectronic laser technologies.