Multicolor luminescence of In 3+ /Mn 2+ alloying in K 3 SbCl 6 synthesized via mechanochemistry

Here, the spectroscopic characterization of In 3+ /Mn 2+ alloying in K 3 SbCl 6 fluorescent material synthesized via mechanochemistry is investigated using thermal-related steady-state and time-resolved photoluminescence (PL) spectroscopy. Under 360 nm ultraviolet light excitation, K 3 SbCl 6 exhibits a broad yellow emission peaking at 592 nm. Subsequently, by alloying In 3+ /Mn 2+ with a specific molar ratio, tunable multicolor emission is achieved in the spectral region from blue-green to red. This represents the first, to the best of our knowledge, successful alloying of In 3+ in antimony (Sb)-based chlorides synthesized via mechanochemistry. Furthermore, temperature-dependent PL reveals a pronounced thermochromic response for K 3 SbCl 6 , with emission shifting from green through yellow to orange within 160–250 K. Finally, yellow, green, and red light-emitting diodes fabricated from pure and In 3+ /Mn 2+ -alloyed K 3 SbCl 6 confirm its practical potential in solid-state lighting.