Wavelength-Tunable and Highly Stable Perovskite-Quantum-Dot-Doped Lasers with Liquid Crystal Lasing Cavities

Area of Science:

• Materials Science
• Optoelectronics
• Quantum Dot Technology

Background:

• Perovskite quantum dots (PQDs) offer tunable optoelectronic properties.
• Developing stable, efficient, and lead-free PQDs is crucial for advanced photonic devices.
• Cholesteric liquid crystals (CLCs) can act as efficient laser cavities.

Purpose of the Study:

• To synthesize all-inorganic, lead-free cesium tin halide perovskite quantum dots (AIPQDs).
• To fabricate AIPQD-doped lasers utilizing cholesteric liquid crystal (CLC) cavities.
• To investigate the lasing performance, stability, and tunability of these novel laser devices.

Main Methods:

• Low-cost solvothermal synthesis of AIPQDs.
• Fabrication of AIPQD-doped lasers with CLC lasing cavities.
• Characterization of lasing threshold, line width, and long-term stability.

Main Results:

• Achieved low lasing threshold (150 nJ/pulse) and narrow line width (0.20 nm).
• Demonstrated highly flexible lasing-wavelength tuning.
• Exhibited long-term stability under ambient storage and high humidity due to CLC protection.
• Suppressed photoluminescence (PL) loss via quantum confinement and amplified PL via CLC band-edge effect.

Conclusions:

• AIPQD-doped CLC lasers offer superior lasing performance and stability compared to traditional perovskite devices.
• The developed AIPQDs and CLC cavity integration presents a viable pathway for advanced photonic applications.
• These lasers hold significant potential for use in lighting, displays, and tunable laser systems.