Mechanoresponsive luminescence triggered by phase transition of a supercooled copper(i) complex†
Camille
Latouche 
ac
and
Sandrine
Perruchas
*a
ac
and
Sandrine
Perruchas
*a
Abstract
Under mechanical stimulation, a copper(I) complex in its supercooled liquid state transforms into a crystalline phase, showing a dramatic emission color change from red to green that is accompanied by a 20-fold increase in the photoluminescence quantum yield up to 87%. This reversible phase transition relies on the intriguing ability of this copper complex to form a supercooled metastable state.
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