Metal-halide perovskite materials demonstrated extraordinary performance in solar cells and light emission in recent years, and their layered low-dimensional counterparts promise even greater tunability due to the huge variety of molecules available for the organic phase. Single octahedra-layer structures act as two-dimensional quantum wells, showing strong quantum confinement and large exciton binding energies. The band gap and light emission can be designed by the choice of the organic cations.

In this talk I will discuss our recent results on the emission tuning via choice of the organic cations, and the exciton phonon coupling, with a focus on angle-resolved polarized Raman and photoluminescence spectroscopy to get insights into the directionality of phonons and emission polarization.