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Figure 1.  (a) Crystal structure of (C₁₂H₂₄O₆)₂Na₂(H₂O)₃Cu₄I₆. (b)–(d) PL spectra of (C₁₂H₂₄O₆)₂Na₂(H₂O)₃Cu₄I₆ under high pressure. (e) 2D heat-map of PL spectra of (C₁₂H₂₄O₆)₂Na₂(H₂O)₃Cu₄I₆ upon compression. (f) Comparison of (C₁₂H₂₄O₆)₂Na₂(H₂O)₃Cu₄I₆ emission intensity at 1 atm and R1 atm.

Figure 2.  (a) UV/Vis absorption spectra of (C₁₂H₂₄O₆)₂Na₂(H₂O)₃Cu₄I₆. (b) 2D heat-map of UV/Vis absorption spectra of (C₁₂H₂₄O₆)₂Na₂(H₂O)₃Cu₄I₆ upon compression. (c) Pressure-induced variations in luminescence peak position and absorption edge position. (d) Pressure-dependent changes in the Stokes shift of (C₁₂H₂₄O₆)₂Na₂(H₂O)₃Cu₄I₆.

Figure 3.  (a) Wavelength changes of different emission states under high-pressure. (b) Emission intensity changes of different emission states under high pressure. (c) High-pressure IR spectroscopy of (C₁₂H₂₄O₆)₂Na₂(H₂O)₃Cu₄I₆. (d) High-pressure Raman spectroscopy of (C₁₂H₂₄O₆)₂Na₂(H₂O)₃Cu₄I₆. (e) Comparison of infrared absorption spectra at 1 atm and R1 atm. (f) Comparison of Raman spectra at 1 atm and R1 atm.

Figure 4.  Schematic diagram of (C₁₂H₂₄O₆)₂Na₂(H₂O)₃Cu₄I₆ energy levels (a) at ambient pressure, (b) below 5.9 GPa, (c) between 5.9 GPa and 9.3 GPa, (d) between 9.3 GPa and 17.2 GPa.