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

## TL;DR

Researchers developed a method to create stable, continuous-wave random lasers using perovskite nanocrystals embedded in glass, enabling new applications in imaging and displays.

## Contribution

A novel low-temperature method to create tunable perovskite nanocrystals in glass for stable continuous-wave random lasing.

## Key findings

- PNCs-in-glass structures were created at temperatures below the glass transition temperature with short processing times.
- Stable continuous-wave single-mode random lasing was achieved with an ultralow threshold of 52.6 mW/cm².
- Flexible random lasers were integrated into polydimethylsiloxane films for speckle-free imaging and dynamic holographic displays.

## 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.

Perovskite nanocrystals-in-glass hierarchical structures achieve stable continuous-wave random lasing.