Electrically-Switchable Gain in Optically Pumped CsPbBr₃ Lasers With Low Threshold at Nanosecond Pumping.

Area of Science:

• Materials Science
• Optoelectronics
• Solid-State Physics

Background:

• Metal halide perovskites, particularly CsPbBr3, show potential for laser diodes due to their stability.
• Achieving continuous-wave (CW) optically pumped lasing in CsPbBr3 has been a significant challenge.
• Existing perovskite lasers often lack stability and require complex fabrication.

Purpose of the Study:

• To demonstrate stable lasing in CsPbBr3 vertical cavity surface emitting lasers.
• To investigate the effect of electrical assistance on CsPbBr3 laser performance.
• To explore a novel strategy for electrical injection lasing in perovskites.

Main Methods:

• Fabrication of CsPbBr3 vertical cavity surface emitting lasers.
• Optical pumping using nanosecond and CW lasers.
• Implementation of electrically assisted optically pumped laser (EAOPL) devices.
• Application of a small positive DC voltage during laser excitation.

Main Results:

• Achieved low lasing thresholds (1.3 µJ cm⁻²) for CsPbBr3 lasers under nanosecond pumping.
• Demonstrated remarkable lasing stability.
• Observed electrically switchable gain in EAOPL devices by utilizing ion migration.
• Significantly reduced lasing thresholds and enhanced cavity mode intensity with applied DC voltage.

Conclusions:

• CsPbBr3 perovskites can support stable lasing with potential for low thresholds.
• Ion migration in EAOPL devices enables electrically switchable gain.
• Combining DC voltage with electrical pulses offers a new route towards electrical injection lasing in CsPbBr3.