Turning Self‐Trapped Exciton Emission to Near‐Infrared Region in Thermochromism Zero‐Dimensional Hybrid Metal Halides

Low dimensional lead-free metal halides have become the spotlight of research on developing multifunctional optoelectronic materials as their properties show a wide range tunability. However, most reported low only function in ultra-violet to visible due large bandgap. Moreover, organic cation based limited thermal stability; other hand, inorganic counterparts suffer from solution processability. A hybrid approach is proposed, where zero (0D) halide ((DFPD)2CsBiI6) developed by using mixed organic–inorganic cations: 4, 4-difluoropiperidine (DFPD) and cesium (Cs+). This ensures both stability Furthermore, [BiI6]3− octahedra are serving active light absorption units, which bandgap be located at region. Its photoluminescence (PL) further shifted near infrared (NIR) region doping (DFPD)2CsBiI6 with antimony (Sb3+). The properties: thermochromic behavior, detection, NIR emitting. study expands scope 0D halides.