Hybrid Chloroantimonates(III): Thermally Induced Triple‐Mode Reversible Luminescent Switching and Laser‐Printable Rewritable Luminescent Paper

Two hybrid chloroantimonates(III), [Bzmim]₃SbCl₆ ( 1 , Bzmim=1‐benzyl‐3‐methylimidazolium, T_m1=410 K) and [Bzmim]₂SbCl₅ ( 2 , T_m2=348 K) are presented. 1 exhibits green emission (quantum efficiency of 87.5 %); 2 exhibits blue and red emissions under the irradiation of 310 and 396 nm light, respectively. Using different cooling methods, crystalline 1 and IL@2 (IL=ionic liquid of [Bzmim]Cl) could be generated from the molten 1 . Reversible structural and PL transformation triggered by moisture or heat was observed between 1 and IL@2 . Such PL switching, combined with the crystallization‐induced PL properties of 1 and 2 , resulted in the firstly reported triple‐mode reversible PL switching, that is, on–off (T>T_m1), color switching (Tm2), and on–off–on (T_m2m1). Furthermore, ink‐ and mask‐free laser‐printable rewritable PL paper was achieved. This study demonstrates the promise of dynamic insertion/extraction of ILs in hybrid chloroantimonates for anti‐counterfeiting and rewritable PL paper.