• • Room-temperature grinding synthesis achieves structural evolution from KCl:Sb3+ to 0D K3SbCl6, yielding near-unity PLQY (approaching 100%), enabling high-efficiency solid-state lighting without high-temperature processing.
• • Ultrafast single-crystal growth via solid-liquid interface diffusion completes in 20 seconds, drastically reducing production time compared to conventional slow evaporation or Bridgman methods, facilitating rapid manufacturing.
• • Temperature sensing in 50–310 K range achieves maximum relative sensitivity of 9.99%/K, outperforming many existing optical thermometers, enabling precise cryogenic thermometry.
• • Demonstrated multifunctionality in information encryption, flexible films, and white LEDs, with stable luminescence, indicating commercial viability for anti-counterfeiting and display technologies.