Perovskite nanocrystals-in-glass hierarchical structures enable stable continuous-wave random lasers.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41544155.
- Also identified by DOI 10.1126/sciadv.adz8460 and PMC identifier 12810581.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Encapsulating perovskite nanocrystals (PNCs) in glass enables enhanced stability of PNCs and numerous applications such as random lasers. However, preparing PNCs and tuning their properties in glass is energy consuming because of high processing temperature and long processing time, and continuous-wave (CW) random lasers have not been achieved. Here, we report modulation of the structure, photoluminescence, and lasing properties of PNCs in glass at temperatures well below the glass transition temperature with a short processing period. We generate tunable PNCs in glass via nanophase separation and ion exchange in the perovskite domains. PNCs-in-glass hierarchical structures are created by controlling nanophase separation and crystallization of PNCs. Substantially increased scattering in the hierarchical structures enables stable CW single-mode random lasing with an ultralow threshold of 52.6 milliwatts per square centimeter. We achieve flexible CW random lasers by incorporating hierarchical structures into the polydimethylsiloxane film. The random lasers are used in speckle-free laser imaging and dynamic holographic displays.