Versatile crystal structure, tunable light

Ionic metal-halide materials adopt many connectivities between metal-halide polyhedra — ranging from isolated units to corner-, edge-, and face-sharing networks (including dimers, trimers, and extended chains/sheets). By controlling the size and connectivity of these building blocks, we tune the volume where an exciton (a bound electron–hole pair) resides. When the emitting unit approaches the size of a single polyhedron (so-called zero-dimensional halides), the materials often show molecular-like optical behavior with broad, Stokes-shifted, and long-lived photoluminescence.

We aim to design and synthesise these structurally versatile, tunable halides with targeted performance for specific applications — using crystal-structure control as the lever.

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