Reversible human-temperature-responsive luminescence switching in a Mn(II)-based metal halide

The flexibility afforded by their modular structure confers fruitful unique properties to organic–inorganic hybrid metal halides (OIMHs). Typically, stimuli-responsive materials have wide applications in thermal imaging, thermometry, and anti-counterfeiting. Herein, the Mn(II)-based OIMHs (TMS)2MnBr4 (TMS = trimethylsulfonium) were prepared through a facile dry ball-milled method. The obtained ball-milled powders show an intriguing phase transition along with emission switching. Importantly, photoluminescence (PL) switching can be realized by simply laying hands on the (TMS)2MnBr4 powders, highlighting their promising application potential in portable thermosensitive devices.