Effect of Temperature and Pressure on Structural and Optical Properties of Organic–Inorganic Hybrid Manganese Halides

Organic–inorganic hybrid metal halides have recently attracted attention in the global research field for their bright light emission, tunable photoluminescence wavelength, and convenient synthesis method. This study reports the detailed properties of (C₁₀H₁₆N)₂MnBr₄, which emits bright green light with a high photoluminescence quantum yield. Results of powder X-ray diffraction, photoluminescence, thermogravimetric analysis, and Raman spectra show the phase transition of (C₁₀H₁₆N)₂MnBr₄ at 430 K. This phase transition was identified as the solid to liquid state of (C₁₀H₁₆N)₂MnBr₄. Moreover, the pressure- and temperature-induced relationship between structural and optical properties in (C₁₀H₁₆N)₂MnBr₄ can be identified. This investigation provides deep insights into the luminescent properties of metal halide crystals and promotes further research.