Highly Efficient Near‐Infrared Emission (IQE 85%/EQE 75%) From [(Mo 6 I 8 )I 6 ] 2− Cluster‐Doped (ETP) 2 SbCl 5 0D Metal Halide Glass for Multifunctional Optoelectronic Applications

Abstract Near‐infrared (NIR) light sources have found extensive applications in bioimaging of biological tissues, plant growth, disease diagnosis, and therapeutics. However, developing high‐performance near‐infrared emitting materials with broad spectral output remains challenging due to limitations in excitation compatibility, quantum efficiency, and material stability. In this study, [(Mo 6 I 8 )I 6 ] 2− (Mo 6 ) cluster‐doped (ETP) 2 SbCl 5 0D metal halide glass through a low‐temperature liquid quenching method is synthesized. X‐ray diffraction results indicate that Mo 6 cluster doping does not disrupt the amorphous structure of the glass. Optical properties show that broadband NIR emission is achieved under blue light excitation, with internal and external quantum efficiencies reaching 85% and 75%, respectively. Time‐resolved spectroscopy and temperature‐dependent photoluminescence analysis elucidate the energy transfer process and the mechanism of high internal quantum efficiency. The glass exhibits excellent resistance to singlet oxygen quenching in the solid state, and the Mo 6 ‐doped material also shows advantages in solution processing for optoelectronic device fabrication. Moreover, (ETP) 2 SbCl 5 :Mo 6 glass demonstrates good NIR emission performance under various excitation modes and in different states. When packaged into NIR phosphor‐converted light‐emitting diode (pc‐LED), it shows excellent spectral stability and outstanding practical application performance in bioimaging, night vision, non‐destructive testing, and plant growth.