Dual-Center Emitting Pacs-MOF⊇Dye Composite Material Featuring Stimuli-Responsive Luminescence-Tuning Behavior for...

To satisfy the rising requirement for luminescence anticounterfeiting technology, the development of luminescent materials with multiple modes of emission and adjustable luminescence properties is essential. On account of the great structural programmability of luminescent metal-organic frameworks (LMOFs), the multiple emitting components can be integrated into the matrices of LMOFs and form the multicentered synergistic emission system; thus, LMOFs can be an ideal platform for fabricating luminescent anticounterfeiting materials. Herein, based on the pore space partition (PSP) strategy, a novel pacs-MOF Mg-TPA-bdc with the formula of {(NH₂Me₂)[Mg₃(μ₃-OH)(bdc)₃(TPA)]·12H₂O}_n (TPA = Tri(pyridin-4-yl)amine; bdc = terephthalic acid) was constructed as a host matrix to encapsulate the acriflavine during the self-assembly process to construct a new dual-centered emission material Mg-TPA-bdc⊇AF, which exhibited blue and green emission under 365 and 460 nm excitation, respectively. Intriguingly, upon external pressure or temperature variation, both of these two materials exhibit reversible stimuli-responsive luminescence-tuning behavior, which can be observed by the naked eye. Considering the charming dual-centered emission features of Mg-TPA-bdc⊇AF, a novel binary-coded microarray data storage matrix with high security reliability, real-time response, and great reversibility was constructed and applied for information encryption and luminescence anticounterfeiting.