Chameleon Materials: The Origin of Color Variation in Low-Dimensional Perovskites
Wide-field photoluminescence micrographs (230_175 μm) show how Perovskite flakes appear bright green and red
Researchers at the University of Groningen have called into question the prevailing explanation for the broad light emission observed in perovskite light-emitting diodes (LEDs), proposing that material defects, rather than intrinsic properties, may be the root cause. Their investigation into low-dimensional perovskites brought to light the significant influence of quantum confinement on the optical characteristics of these materials. By demonstrating this link, the study suggests a paradigm shift in understanding how perovskites behave optically.
This breakthrough discovery could have profound implications for the future design of perovskite LEDs capable of emitting light across a wide spectrum. Such advancements might pave the way for the simplified production of white light LEDs, potentially leading to more efficient lighting solutions. Published in the prestigious journal Nature Communications, this research underscores the critical importance of gaining a deep understanding of perovskite materials for their successful integration into optoelectronic devices and applications.
More information:
Simon Kahmann, Eelco K. Tekelenburg, Herman Duim, Machteld E. Kamminga and Maria A. Loi: Extrinsic nature of the broad photoluminescence in lead iodide-based Ruddlesden-Popper perovskites. Nature Communications (2020). DOI: 10.1038/s41467-020-15970-x
https://phys.org/news/2020-05-chameleon-materials-variation-low-dimensional-perovskites.html