Simultaneous Broadening and Enhancement of Cr 3+ Photoluminescence in LiIn 2 SbO 6 by Chemical Unit Cosubstitution: Night-Vision and Near-Infrared Spectroscopy Detection Applications

• Published in: Angewandte Chemie International Edition Vol. 60; no. 26; pp. 14644 - 14649
• Main Authors: Liu, Dongjie, Li, Guogang, Dang, Peipei, Zhang, Qianqian, Wei, Yi, Lian, Hongzhou, Shang, Mengmeng, Lin, Chun Che, Lin, Jun
• Format: Journal Article
• Language: English
• Published: Germany 21.06.2021
• Subjects: photoluminescence tuning; chemical unit cosubstitution; near-infrared emitting phosphor; night-vision; NIR spectroscopy
• ISSN: 1433-7851; 1521-3773
• DOI: 10.1002/anie.202103612

Near-infrared (NIR)-emitting phosphor materials have been extensively developed for optoelectronic and biomedical applications. Although Cr -activated phosphors have been widely reported, it is challenging to achieve ultra-broad and tunable NIR emission. Here, a new ultra-broadband NIR-emitting LiIn SbO :Cr phosphor with emission peak at 965 nm and a full-width at half maximum of 217 nm is reported. Controllable emission tuning from 965 to 892 nm is achieved by chemical unit cosubstitution of [Zn -Zn ] for [Li -In ], which can be ascribed to the upshift of T energy level due to the strengthened crystal field. Moreover, the emission is greatly enhanced, and the FWHM reaches 235 nm. The as-prepared luminescent tunable NIR-emitting phosphors have demonstrated the potential in night-vision and NIR spectroscopy techniques. This work proves the feasibility of chemical unit cosubstitution strategy in emission tuning of Cr -doped phosphors, which can stimulate further studies on the emission-tunable NIR-emitting phosphor materials.