Photoluminescence
of Eu3+ in DMSO is intense and ultrasensitive
to water, thereby providing a novel method for water detection. Herein,
for the first time, we investigated the effects of Eu3+ concentration on luminescence and developed a multiparameter method
for trace water detection based on a single luminescence agent. To
further extend its practical applications, we explored its performance
for water detection in ethanol and gasoline. Our findings demonstrate
that it is a sensitive and reliable probe for the detection of a wide
concentration range of water in ethanol (0–24.24%) and gasoline
(0–32.43%), making Eu–DMSO a promising candidate to
detect water in a wide concentration range. These phenomena not only
make Eu–DMSO a sensitive agent for in situ water detection
in real time but also provide scientifically interesting mechanisms
behind its application as a water sensing probe.