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Sub-1/10 exciton threshold lasers using stable self-charged perovskite quantum rods
Jialu Li1, Xue Han1, Wenjie Wang2
1State Key Laboratory of Quantum Optics Technologies and Devices, Institute of Laser Spectroscopy, Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China.
Science Advances
|July 24, 2026
Summary
Researchers developed stable, self-charged perovskite quantum rods (QRs) that achieve ultra-low lasing thresholds. This breakthrough in optical gain materials significantly reduces Auger recombination, paving the way for advanced laser applications.
Area of Science:
- Materials Science
- Optics
- Quantum Engineering
Background:
- Colloidal quantum dots (QDs) show promise as optical gain materials but face challenges.
- High lasing thresholds, Auger recombination, and unstable charging limit QD performance.
- Theoretical QD charging can reduce thresholds but is hindered by practical limitations.
Purpose of the Study:
- To theoretically optimize charging and Auger recombination for minimizing lasing thresholds.
- To experimentally develop stable, self-charged perovskite quantum rods (QRs) as an alternative to QDs.
- To achieve low-threshold lasing in engineered QRs.
Main Methods:
- Theoretical modeling of optimal charging number and Auger recombination.
- Developing stable, self-charged perovskite quantum rods using state engineering and Mn doping.
- Experimental characterization of nonradiative Auger recombination and lasing performance.
Main Results:
- Achieved a two-order-of-magnitude reduction in nonradiative Auger recombination in QRs.
- Enabled QRs to support a high charging number (up to 6).
- Demonstrated QR liquid lasing with a sub-1/10 exciton threshold (0.098 excitons/QR) via 5-ns pulse pumping.
Conclusions:
- Engineered perovskite quantum rods offer a viable alternative to QDs for optical gain.
- The developed QRs exhibit exceptionally low lasing thresholds, surpassing current QD lasers.
- These findings highlight the potential of engineered QRs for future laser applications.
