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How lasing happens in CsPbBr3 perovskite nanowires
Andrew P Schlaus1, Michael S Spencer1, Kiyoshi Miyata1
1Department of Chemistry, Columbia University, New York, NY, 10027, USA.
Nature Communications
|January 18, 2019
Summary
Lasing in lead halide perovskites originates from electron-hole plasma stimulated emission. Time-resolved measurements reveal anomalous blue-shifting, indicating plasmon emission in CsPbBr3 perovskite nanowires.
Area of Science:
- Optoelectronics
- Materials Science
- Solid-State Physics
Background:
- Lead halide perovskites are promising for optoelectronics.
- Lasing mechanisms in these materials are not fully understood.
- Previous studies lacked time resolution.
Purpose of the Study:
- Investigate the mechanism of lasing in CsPbBr3 perovskite nanowires.
- Utilize picosecond time-resolved spectroscopy.
- Clarify the underlying physics of perovskite lasing.
Main Methods:
- Picosecond time-resolved spectroscopy.
- Measurement of lasing gain profile in CsPbBr3 nanowires.
- Analysis of time-dependent spectral shifts.
Main Results:
- Lasing originates from stimulated emission of an electron-hole plasma.
- Anomalous blue-shifting of the lasing gain profile was observed up to 25 ps.
- This spectral shift is a signature of lasing involving plasmon emission.
Conclusions:
- The study elucidates the lasing mechanism in lead halide perovskites.
- Time-resolved measurements reveal complex many-body physics.
- Plasmon emission plays a role in CsPbBr3 perovskite nanowire lasing.
