Piezochromic fluorescence of anthracene derivative crystals with different stacking patterns designed around excimers

Abstract

The wide application of excimer materials in the OLED field is mainly based on the regulation of their stacking structure. Therefore, based on whether anthracene groups can form excimers, three anthracene derivative molecules with sterically hindered substituents were designed and their crystals with different aggregating structures were prepared to study the relationship between their structures and properties. Under high pressures, these anthracene groups exhibit enhanced fluorescence during the formation of excimers (in the pressure range of 2.3 to 4.2 GPa) while the anthracene groups that have already formed excimers under ambient conditions exhibit a wider red-shift range. Their abundant piezochromic fluorescence behavior indicate that regulating the aggregation mode of anthracene groups can meet different application requirements and provide guidance for the expansion of the application of excimer materials.