Deep Eutectic Solvent Matrix for Hybrid Indium Chloride Glasses With Tunable Luminescence

ABSTRACT Hybrid metal halide (HMH) glasses are emerging as superior photonic candidates, yet their development is fundamentally hindered by the high crystallization propensity of ionic frameworks. To circumvent this thermodynamic barrier, we report a deep eutectic solvent (DES)‐mediated strategy that leverages a dynamically crosslinked hydrogen‐bonding network to kinetically suppress long‐range ordering. Utilizing a DES architecture composed of 3‐aminopiperidine dihydrochloride and 2‐hydroxypropionamide, we successfully fabricate amorphous indium chloride glasses that preserve essential short‐range structural motifs while entirely eliminating lattice crystallinity. This rigid yet adaptive matrix facilitates efficient intersystem crossing through enhanced spin‐orbit coupling and minimizes nonradiative dissipation, thereby enabling robust afterglow emission. Furthermore, the strategic incorporation of [SbCl 6 ] 3− centers and organic fluorophores allows for precise modulation of excited‐state dynamics via host‐guest energy transfer and triplet excitons harvesting, yielding broad‐spectrum luminescence from blue to red. These hybrid glasses integrate prompt fluorescence, self‐trapped exciton emission, and room‐temperature phosphorescence, achieving a maximum lifetime of 283.41 ms and a photoluminescence quantum yield of 46.90%. This multifunctional platform demonstrates significant potential for multilevel anti‐counterfeiting and spatiotemporal information encoding. Ultimately, this work establishes DES chemistry as a versatile paradigm for customizing HMH glasses, paving the way for programmable, high‐performance photofunctional materials.