Temperature-Dependent Lasing of CsPbI₃ Triangular Pyramid.

Area of Science:

• Materials Science
• Optoelectronics
• Quantum Optics

Background:

• Cesium lead iodide (CsPbI3) is a promising perovskite material for optoelectronic applications.
• Microsized optical cavities are crucial for investigating light-matter interactions.
• Understanding lasing properties of microstructures is key for device optimization.

Purpose of the Study:

• To evaluate the lasing performance of microsized single-crystal CsPbI3 triangular pyramids (MSCTPs).
• To investigate the temperature dependence of the lasing threshold in MSCTPs.
• To explore the potential of MSCTPs in optoelectrical devices and quantum optics research.

Main Methods:

• Synthesis of well-defined MSCTPs on Si/SiO2 substrates using chemical vapor deposition.
• Measurement of spontaneous and stimulated emission spectra.
• Determination of lasing thresholds at low temperatures (148-223 K).

Main Results:

• MSCTPs exhibit spontaneous emission around 719 nm at room temperature.
• Stimulated emission was observed in a single Fabry-Perot mode between 148-223 K.
• Lasing threshold ranges from 21.56 to 53.15 μJ/cm², showing temperature dependence explained by exciton binding and thermal energy competition.

Conclusions:

• MSCTPs demonstrate viable lasing characteristics with a notable temperature dependence.
• The findings provide a pathway for engineering perovskite-based optoelectrical devices.
• This work facilitates further investigation of light-matter interactions in microsized optical cavities.