Near-Infrared Dual Emission from the Au42(SR)32 Nanocluster and Tailoring of Intersystem Crossing

This work presents the synthesis and intriguing photoluminescence of the Au42(PET)32 (PET = 2-phenylethanethiolate) nanocluster (NC). The Au42(PET)32 NC exhibits dual emission at 875 and 1040 nm, which are revealed to be fluorescence and phosphorescence, respectively. The emission quantum yield (QY) of Au42(PET)32 in dichloromethane is 11.9% at room temperature in air, which is quite rare for thiolate-protected Au NCs. When Au42(PET)32 NCs are embedded in polystyrene films (solid state), the fluorescence was dramatically suppressed while the phosphorescence was significantly enhanced. This divergent behavior is explained by dipolar interaction-induced enhancement of intersystem crossing from singlet to triplet excited state.

Automated summary

The synthesis and photoluminescence of the Au42(PET)32 nanocluster are presented in this work. The nanocluster exhibits dual emission, with fluorescence and phosphorescence at different wavelengths. The emission quantum yield is 11.9% in liquid state and the fluorescence is suppressed while the phosphorescence is enhanced in solid state, which can be explained by interaction-induced transition.