Angewandte Chemie International Edition
10.1002/anie.202006184
RESEARCH ARTICLE
mechanoluminescence observed in the 2D-C4/3D composite.
Upon mechanical treatment a multi-layered structure is produced
at the 2D/3D interface able to activate bright green emission from
the (otherwise non-emissive) 3D component by energy transfer
processes. Our findings pave the way for using powder samples
of hybrid perovskites as highly sensitive MCL materials with
potentialities of tuning emission colours depending of the nature
of organic cations, metal ions or halide, for applications in the field
of mechanosensors, security papers or optical storage.
Acknowledgements
M. B. H. S. thanks the University of Sfax and the University of
Angers for a PhD grant
Keywords: • hybrid perovskite • interface • luminescence •
Figure 5. Summary of the photoluminescence processes in the 2D (top), 2D/3D
pristine (middle) and 2D/3D crushed (bottom) crystal powders. a, Emission
spectra; b, scheme summarizing the MCL properties of the 2D-C4/3D
composite, highligting the key role of the interface between both components;
c, scheme of the main energy levels involved in the emission processes with
photo of the powders under UV illumination.
mechanochromic luminescence • perovskite phases
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5
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