Two-dimensional (2D) hybrid organic-inorganic halide perovskites exhibit enhanced environmental stability and efficient excitonic emission. Altering soft organic and rigid inorganic layers produce a complex response to high pressure, resulting in various phenomena such as tuning of band gap and excitonic energy, phase transitions, and PL enhancement. Understanding the structure-properties relations is crucial to achieving similar improved properties under ambient conditions. In this talk, several indicative examples of the high-pressure evolution of 2D perovskites with different organic components are presented. Discussion of the structural and optical properties is based on in-situ Raman and PL microscopy and imaging.
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