Liu Gaochao, Hu Tao, Molokeev Maxim S, Xia Zhiguo
State Key Laboratory of Luminescent Materials and Devices, Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China.
Laboratory of Crystal Physics, Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia.
iScience. 2021 Mar 1;24(4):102250. doi: 10.1016/j.isci.2021.102250. eCollection 2021 Apr 23.
Near-infrared (NIR) phosphor-converted light-emitting diode (pc-LED) has great potential in non-invasive detection, while the discovery of tunable broadband NIR phosphor still remains a challenge. Here, we report that Cr-activated LiInSbO exhibits a broad emission band ranging from 780 to 1400 nm with a full width at half maximum (FWHM) of 225 nm upon 492 nm excitation. The emission peaks are tuned from 970 to 1020 nm together with considerable broadening of FWHM (∼285 nm) via Li/Na substitution. Depending on Yb co-doping, a stronger NIR fluorescence peak of Yb appears with improved thermal resistance, which is ascribed to efficient energy transfer from Cr to Yb. An NIR pc-LED package has been finally designed and demonstrated a remarkable ability to penetrate pork tissues (∼2 cm) so that the insertion depth of a needle can be observed, indicating that the phosphor can be applied in non-destructive monitoring.
近红外（NIR）磷光转换发光二极管（pc-LED）在无创检测方面具有巨大潜力，然而，可调谐宽带近红外磷光体的发现仍然是一个挑战。在此，我们报道了Cr激活的LiInSbO在492nm激发下表现出780至1400nm的宽带发射带，半高宽（FWHM）为225nm。通过Li/Na取代，发射峰从970nm调谐到1020nm，同时FWHM显著展宽（约285nm）。取决于Yb共掺杂，出现了更强的Yb近红外荧光峰且热稳定性提高，这归因于从Cr到Yb的有效能量转移。最终设计了一种近红外pc-LED封装，并展示了其穿透猪肉组织（约2cm）的显著能力，从而可以观察到针的插入深度，表明该磷光体可应用于无损监测。
