AI Article Synopsis
- Hybrid metal halides are a new type of semiconductor with unique light-emitting properties, specifically involving free and self-trapped exciton emissions.
- Researchers successfully transformed the broader self-trapped exciton emission into sharp free exciton emission in a specific hybrid metal halide using high-pressure techniques.
- The study highlights that manipulating pressure can control excitonic behavior, showing that wider ribbon structures (n > 2) are crucial for achieving desired exciton emissions without needing chemical adjustments.
Article Abstract
Hybrid metal halides represent a novel type of semiconductor light emitters with intriguing excitonic emission properties, including free exciton emission and self-trapped exciton emission. Achieving precise control over these two excitonic emissions in hybrid metal halides is highly desired yet remains challenging. Here, the complete transformation from intrinsically broadband self-trapped exciton emission to distinctively sharp free exciton emission in a quasi-one-dimensional hybrid metal halide (CHN)[PbBr]·6Br with a ribbon width of n = 4, is successfully achieved based on high-pressure method. During compression, pressure-induced phonon hardening continuously reduces exciton-phonon coupling, therefore suppressing excitonic localization and quenching the original self-trapped exciton emission. Notably, further compression triggers excitonic delocalization to induce intense free exciton emission, accompanied with reduced carrier effective masses and improved charge distribution. Controlled high-pressure investigations indicate that the ribbon width of n > 2 is necessary to realize excitonic delocalization and generate free exciton emissions in similar quasi-one-dimensional hybrid metal halides. This work presents an important photophysical process of excitonic transitions from self-trapped exciton emission to free exciton emission in quasi-one-dimensional hybrid metal halides without chemical regulation, promoting the rational synthesis of hybrid metal halides with desired excitonic emissions.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11349761 | PMC |
| http://dx.doi.org/10.1038/s41467-024-51836-2 | DOI Listing |
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