Light amplification in perovskite nanosheets
Researchers boost signal amplification in perovskite nanosheets
Perovskite materials are still attracting a lot of interest in solar cell applications. Now, the nanostructures of perovskite materials are being considered as a new laser medium. Over the years, light amplification in perovskite quantum dots has been reported, but most of the works present inadequate quantitative analysis.
To assess the light amplification ability, a “gain coefficient” is necessary, whereby the essential characteristic of a laser medium is revealed. An efficient laser medium is one that has a large gain, and scientists have been exploring ways to boost this gain.
Now, in a recent study, a team of researchers led by Professor Kwangseuk Kyhm from the Department of Optics & Mechatronics at Pusan National University in Korea has managed to enhance signal amplification in perovskite nanosheets of CsPbBr3 with a unique waveguide pattern.
Their study is published in the journal Light: Science & Applications.
Perovskite nanosheets are two-dimensional structures arranged in sheet-like configurations on the nanoscale and possess characteristics that make them valuable for various applications.
Their achievement overcomes the shortcomings of CsPbBr3 quantum dots, whose gain is inherently limited due to the Auger process, which essentially shortens the decay time for population inversion (a state in which more members of the system are in higher, excited states than in lower, unexcited energy states).
Prof. Kyhm explains, “Perovskite nanosheets can be a new laser medium, and this work has demonstrated that light amplification can be achieved based on tiny perovskite nanosheets that are synthesized chemically.” … learn more
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