Liquid-phase sintering of lead halide perovskites and metal-organic framework glasses
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Tiny crystals of an inherently unstable photoluminescent semiconductor become much more robust when encased in a glassy matrix, opening the way to use them in LED lighting and device screens.
A class of semiconductors known as lead halide perovskites have excellent optoelectronic properties that could see them replace silicon-based and other conventional semiconductors in solar cells and optoelectronic devices. But heat, moisture, intense light, and water can make them unstable and they can leak toxic lead ions.
Now, a team led by researchers at the University of Queensland in Australia has overcome these problems by forming a composite between nanocrystals of lead halide perovskite and a special type of glass.
The glass acts as a matrix that stabilizes the lead halide perovskite, and its photoluminescence holds up well even when it is immersed in water for thousands of hours.
- Science 374, 621–625 (2021). doi: 10.1126/science.abf4460