Synchronous Temperature and Magnetic Field Dual‐Sensing by Luminescence in a Dysprosium Single‐Molecule Magnet

Sensors are increasingly present in the everyday life in widespread technological applications, and engineering smart systems able to simultaneously detect different physical quantities represents a scientific challenge. Taking advantage of the molecular chemistry realm that offers the possibility to finely adjust physical properties, it is demonstrated herein that the luminescent single‐molecule magnet [Dy(acac)3(H2O)2]·H2O (acac = acetylacetonate) acts as a dual and synchronous thermometric/magnetic optical sensor in large ranges (10.0–180.0 K and up to ≈45 T) holding the promise to detect their variations in future devices. The first optical sensor able to probe simultaneously the temperature and the magnetic field strength in a large range is demonstrated using a single‐molecule magnet. A simple Dy3+ coordination complex can act as a dual and synchronous magnetic field/temperature optical sensor using cost‐effective photoluminescence spectroscopy.