Spectroscopy results of Mixed Halide Perovskites

This data includes the raw and machine-readable spectra of the mixed halide perovskites single crystals obtained via several spectroscopy techniques. The spectroscopy techniques uploaded here are Raman spectroscopy and Brillouin spectroscopy. Raman measurements were taken on a standard Raman spectrometer (LabRam HR800, Horiba Co., Japan). Brillouin spectra were obtained using a standard tandem multi-pass Fabry–Perot interferometer (TFP-2, JRS Co., Zurich, Switzerland). 532 nm wavelength laser was used to probe the samples. The spectra are taken at various temperatures. The temperatures are mentioned in the file title. Moreover, temperature-dependent powder XRD patterns are also uploaded which were measured using a high-resolution XRD spectrometer (PANalytical; X’pert PRO MPD) at the Cu K-radiation (λ =1.5406 Å).