Phonon Directionality Determines the Polarization of the Band-Edge Exciton Emission in Two-Dimensional Metal Halide Perovskites
arxiv(2024)
摘要
Two-dimensional metal-halide perovskites are highly versatile for
light-driven applications due to their exceptional variety in material
composition, which can be exploited for tunability of mechanical and
optoelectronic properties. The band edge emission is governed by the exciton
fine structure that is defined by structure and composition of both organic and
inorganic layers. Moreover, electronic and elastic properties are intricately
connected in these materials. Electron-phonon coupling plays a crucial role in
the recombination dynamics. However, the nature of the electron-phonon
coupling, as well as which kind of phonons are involved, is still under debate.
Here we investigate the emission and phonon response from single
two-dimensional lead-iodide microcrystals with angle-resolved polarized
spectroscopy. We find an intricate dependence of the emission polarization with
the vibrational directionality in the materials, which clearly reveals that
several bands of the low-frequency phonons of the inorganic lead-iodide
perovskite lattice play the key role in the band edge emission. Our findings
demonstrate how the emission spectrum and polarization of two-dimensional
layered perovskites can be designed by their material composition, which is
essential for optoelectronic applications, where fine control on the spectral
and structural properties of the light is desired.
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