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Published on: February 25, 2017
Perovskite nanocrystals-in-glass hierarchical structures enable stable continuous-wave random lasers
Xinkuo Li1, Chenduan Chen1, Ke Sun2
1State Key Laboratory of Extreme Photonics and Instrumentation, College of Optical Science and Engineering, College of Optical Science and Engineering, and School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China.
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.
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.
