Temperature-dependent absorption, PL, PLE and Raman measurements in Cs2Au2Cl6 attribute the material's extremely low photoluminescence to a polar indirect valley controlled by a temperature-dependent saddle-point activation energy.
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Polar Indirect Valley as a Limiting Factor for Radiative Efficiency in Gold-Based Mixed-Valence Double Perovskites
Temperature-dependent absorption, PL, PLE and Raman measurements in Cs2Au2Cl6 attribute the material's extremely low photoluminescence to a polar indirect valley controlled by a temperature-dependent saddle-point activation energy.