Lifetime of low-density water domains in salt solutions by time-resolved Delayed Luminescence

► When formation of LDW domains is foreseen in literature, salt solutions exhibit measurable Delayed Luminescence (DL) signals. ► DL intensity decreases with increasing temperature according to an Arrhenius trend characterized by an activation energy ΔE = 14 ± 2 kJ mol−1. ► The probability distribution of the DL decay times shows a maximum in the microsecond range.