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Related Experiment Video

Updated: Oct 10, 2025

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Solution-processed whispering-gallery-mode microsphere lasers based on colloidal CsPbBr3perovskite nanocrystals.

Minghong Xie1, Wenxiao Gong2, Lei Kong1

  • 1Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu 610031, People's Republic of China.

Nanotechnology
|December 8, 2021
PubMed
Summary

We developed low-cost, high-performance microlasers using perovskite nanocrystals (NCs). These CsPbBr3NC-based devices offer spectrally tunable, durable room-temperature lasing for photonic applications.

Keywords:
CsPbBr3 perovskite nanocrystalslow-thresholdmicrolaserssingle-mode lasingwhispering-gallery-mode

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Area of Science:

  • Materials Science
  • Optics and Photonics
  • Nanotechnology

Background:

  • Perovskite nanocrystals (NCs) are promising gain materials for solution-processed microlasers.
  • Developing high-performance, low-cost perovskite NC-based microlasers remains a challenge.

Purpose of the Study:

  • To demonstrate low-threshold, spectrally tunable lasing from CsPbBr3NCs on silica microspheres.
  • To investigate the lasing mechanism and stability of these perovskite NC microlasers.

Main Methods:

  • Fabrication of CsPbBr3NCs deposited on silica microspheres.
  • Characterization using whispering-gallery-mode (WGM) lasing measurements.
  • Time-resolved photoluminescence (TRPL) spectroscopy to determine the lasing mechanism.

Main Results:

  • Achieved low-threshold (∼3.1 μJ cm-2) WGM lasing with a cavity quality factor of ∼1193.
  • Identified electron-hole plasma recombination as the lasing mechanism.
  • Demonstrated spectrally tunable single-mode lasing by adjusting microsphere diameter.
  • Observed durable room-temperature lasing stability exceeding 107 laser shots.

Conclusions:

  • CsPbBr3NC-based microlasers offer a promising platform for low-cost, high-performance photonic devices.
  • The demonstrated stability and tunability pave the way for practical applications in photonics.