Manipulating the Carrier Transfer Dynamics Enabled by Electron Cloud Redistribution for Low-Threshold Red Perovskite...

Area of Science:

• Materials Science
• Optoelectronics
• Photonics

Background:

• Metal-halide perovskites are promising for red photonic sources.
• Current red perovskite lasers suffer from defect-induced losses and lattice instability.

Purpose of the Study:

• To enhance red laser performance in perovskite films.
• To suppress defects and improve carrier recombination pathways.

Main Methods:

• Incorporation of phenethylammonium trifluoroacetate (PEATFA) into CsPbBrI2 films.
• Regulating surface electron cloud and coordinating with Pb2+ ions.
• Constructing a vertical cavity for lasing.

Main Results:

• Passivated films showed enhanced lattice rigidity and defect suppression.
• Achieved rapid carrier transfer, improved gain coefficient, and extended gain lifetime (276 ps).
• Demonstrated room-temperature red single-mode lasing at 660 nm with a low threshold (9.42 μJ cm-2) and high polarization (87.4%).

Conclusions:

• PEATFA passivation offers a robust route for miniaturized red laser sources.
• The study provides a versatile platform for integrated photonic devices.
• This advancement is crucial for biomedical and industrial laser applications.