Efficient broadband near-infrared luminescence of Cr3+ doped fluoride K2NaInF6 and its NIR-LED application toward veins imaging

作者：Wu, Zixuan; Han, Xinxin^*; Zhou, Yayun; Xing, Ke; Cao, Sheng; Chen, Li; Zeng, Ruosheng; Zhao, Jialong; Zou, Bingsuo^*

来源：Chemical Engineering Journal, 2022, 427: 131740.

DOI：10.1016/j.cej.2021.131740

• Fluoride phosphor
• Broadband near-infrared
• High power NIR LED
• Biological imaging
• K2NaInF6
• Cr3+

High performance broadband Near-infrared (NIR) phosphors with high efficiency and excellent thermal stability are highly demanded for constructing the next generation of NIR radiation sources. Herein, a broadband NIR emitting fluoride phosphor K2NaInF6:Cr3+ peaking at 774 nm with a Full width at half maximum (FWHM) of 116 nm (1906 cm-1) was demonstrated. A high Internal quantum efficiency (IQE) value of 70.2% can be obtained in the as-synthesized K2NaInF6:Cr3+ phosphor. Additionally, benefiting from the relatively weak electron phonon coupling effect, the phosphor also exhibits excellent anti-thermal quenching behavior with the emission intensity at 150 degrees C retaining 78.3% of that at room temperature. A high power NIR pc-LED with NIR radiant flux of 492.85 mW@1050 mA is obtained by combing the as-synthesized K2NaInF6:Cr3+ phosphor and a blue LED chip. Utilizing this high power NIR pc-LED as NIR radiation source, high-resolution human hand veins imaging is realized with the assistance of a NIR camera, which indicates that K2NaInF6:Cr3+ phosphor has high potential in biological applications.

• 单位
  广西大学