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Perovskite nanocrystals-in-glass hierarchical structures enable stable continuous-wave random lasers.

Xinkuo Li1, Chenduan Chen1, Ke Sun2

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Researchers developed a new method to create stable perovskite nanocrystals (PNCs) in glass, enabling low-threshold continuous-wave (CW) random lasers. This energy-efficient process allows for tunable PNCs and flexible laser applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Perovskite nanocrystals (PNCs) offer enhanced stability and applications like random lasers when encapsulated in glass.
  • Current methods for preparing PNCs in glass are energy-intensive due to high temperatures and long processing times, and have not achieved continuous-wave (CW) random lasing.

Purpose of the Study:

  • To develop an energy-efficient method for modulating perovskite nanocrystal (PNC) properties within glass.
  • To achieve stable continuous-wave (CW) random lasing from PNCs in glass at low processing temperatures and short durations.

Main Methods:

  • Modulation of PNC structure, photoluminescence, and lasing properties in glass below the glass transition temperature.
  • Generation of tunable PNCs via nanophase separation and ion exchange within perovskite domains.
  • Creation of PNCs-in-glass hierarchical structures through controlled nanophase separation and crystallization.

Main Results:

  • Achieved tunable PNCs in glass with modulated properties at significantly reduced processing temperatures and times.
  • Engineered PNCs-in-glass hierarchical structures exhibiting substantially increased scattering.
  • Demonstrated stable CW single-mode random lasing with an ultralow threshold of 52.6 mW/cm².

Conclusions:

  • Developed an energy-efficient method for producing tunable PNCs in glass, enabling stable CW random lasing.
  • Created flexible CW random lasers by integrating hierarchical structures into polydimethylsiloxane films.
  • Showcased applications in speckle-free laser imaging and dynamic holographic displays.