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

Yang Li1,2,3, Shangpu Liu2,4, Thomas Feeney2,3

  • 1College of Materials Science and Engineering & Engineering Research Center of Alternative Energy Materials and Devices, Ministry of Education, Sichuan University, Chengdu, 610065, China.

Small (Weinheim an Der Bergstrasse, Germany)
|February 24, 2025
PubMed
Summary

Researchers achieved stable lasing in cesium lead bromide (CsPbBr3) perovskite lasers. Electrically assisted optical pumping significantly reduced lasing thresholds, paving the way for electrical injection lasing in these promising materials.

Keywords:
VCSELcontinuous‐waveelectrically injection lasingion migrationperovskite

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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.