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Markedly Strengthened Delayed Fluorescence and Processability in Crystalline Hybrids via Solvation-Enhanced
Wen-Jing Shi1, Rui-Hong Wang1, Jun Chen2
1School of Chemistry, Dalian University of Technology, Dalian116024, China.
None:
Crystalline afterglow materials hold broad application potential yet suffer from poor processability. Herein, we report a strategy that enhances both processability and luminescence through solvation-enhanced self-dissolution-recrystallization. Two low-cost, nonaromatic inorganic-organic afterglow hybrids─featuring solvated Zn2+ ions─were prepared. Host-guest doping enables wide-range tuning of room-temperature phosphorescence (RTP) color and extended lifetimes. Thermal annealing further enhances RTP and strongly activates delayed fluorescence (DF), increasing the DF lifetime by up to 254×. This enhancement is driven by dehydration of Zn2+ and coordination to guest carboxylate groups, which suppresses nonradiative decay and promotes reverse intersystem crossing. Remarkably, abundant lattice water enables self-dissolution upon heating, recrystallization upon cooling, and full recovery via water vapor fumigation─conferring excellent processability. This work provides a new design route to low-cost, processable crystalline materials with multimodal and tunable long-lived luminescence.
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