A Super‐Broadband NIR Dual‐Emitting Mg<sub>2</sub>SnO<sub>4</sub>:Cr<sup>3+</sup>,Ni<sup>2+</sup> Phosphor for Ratiometric Phosphor‐Converted NIR Light Source Applications
Bo‐Mei Liu, Xiao‐Xuan Guo, Lin Huang, Rong‐Fu Zhou, Rui Zou, Chong‐Geng Ma, Jing Wang
Abstract
Abstract Near‐infrared (NIR) phosphor‐converted light‐emitting diodes (pc‐LEDs) have sparked tremendous interest in NIR spectroscopy. However, conventional NIR pc‐LEDs with a narrow full‐width at half‐maximum (FWHM) and single‐emission block the detection scope and detection accuracy for NIR spectroscopy analysis. Herein, a multicenter strategy is developed for the preparation of blue‐light‐excitable Mg 2 SnO 4 :Cr 3+ ,Ni 2+ phosphors with NIR dual‐emission (λ em = 830/1480 nm, total FWHM = 532 nm). Benefiting from the unique NIR dual‐emission, a ratiometric measurement system with a self‐calibration function is established for highly precise and nondestructive detection. For the first time, a good linear relationship with a detection limit of 0.22 wt.% is achieved for quantitative, non‐invasive detection of water/ethanol mixtures in the field of NIR spectroscopy applications. Additionally, a super‐broadband pc‐LED with a NIR output power of 16.1mW@300 mA is fabricated, demonstrating its applications in high‐penetration imaging and anticounterfeiting. These results provide an approach to achieving NIR dual‐emission phosphor, thereby opening a new avenue for exploring ratiometric NIR spectroscopy techniques.