This study investigates the aggregation-induced room-temperature phosphorescence (RTP) of trinuclear Au(I) complexes. The RTP is highly sensitive to crystal structure, with variations in alkyl side chains affecting both crystal structure and RTP maximum. Reversible RTP color changes are observed in nanocrystals due to phase transitions between crystal polymorphs during growth or pulverization. The mechanism involves intermolecular interactions within the crystal structure. The findings enhance understanding of crystallization mechanisms and may lead to new material properties in nano- to micrometer-sized solids.
