An ultra-sensitive ratiometric fluorescent thermometer based on monomer and excimer dual emission

By leveraging natural saturated fatty acids with distinct melting points and swift reversible phase transitions, we correlated external thermal cues to monomer and excimer emissions of difluoroboron beta-diketonate fluorophores. This integration yielded a ratiometric fluorescent thermometer showcasing unparalleled sensitivity and thermochromism in the physiological temperature range. Using phase transition materials to control the aggregation state of difluoroboron beta-diketonate fluorophores, a high-sensitivity ratiometric fluorescent thermometer based on monomer and excimer dual emission is achieved.