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a) Generic configurational coordinate diagram illustrating the origin of STE PL in Cs4−xAxSn(Br1−yIy)6. b) Ground‐state and excited‐state (STE) HOMOs and LUMOs. c) Experimental and theoretical results demonstrating that PL energy varies linearly with the ratio of c‐axis to a‐axis length. Variable‐temperature measurements (three data points; black circles) are plotted for Cs4SnBr6 at 100 K, 200 K, and 273 K.
