Huang Mingqin, Dai Mengmeng, Li Kejie, Wei Yanling, Fu Zuoling
Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University, Changchun 130012, China.
School of Data Science and Artificial Intelligence, Jilin Engineering Normal University, Changchun 130052, China.
Spectrochim Acta A Mol Biomol Spectrosc. 2025 Mar 15;329:125603. doi: 10.1016/j.saa.2024.125603. Epub 2024 Dec 15.
Near-infrared optical thermometers have sparked great interest for their ability to provide non-destructive testing and high-resolution. However, the restricted relative sensitivity and single temperature measurement mode represent the current limitations of luminescent thermometers. Herein, near-infrared dual-mode ratiometric thermometers with high sensitivity in La(MoO): Yb, Ln (LMO: YbLn, Ln = Er, Ho, Nd) phosphors were designed. Interestingly, excellent thermal enhancement of near-infrared emission (Nd: F → I) over 492 times was observed through effective phonon-assisted energy transfer process, resulting in an ultra-high relative sensitivity of 2.84 % K at 313 K. Furthermore, a near-infrared ratiometric thermometer was fabricated utilizing the I energy level of Ho (1200 nm) and the I energy level of Er (1550 nm). Relying on the luminescence thermal enhancement of Er and the luminescence thermal burst of Ho, a relative sensitivity of 0.31 % K at 573 K was obtained. The excellent near-infrared emission of the sample was reasonably confirmed through spectral monitoring of penetrating chicken breast of different thicknesses. These findings provide a viable approach for the design of near-infrared phosphors, which has the potential to impact the field of near-infrared temperature sensing.
近红外光学温度计因其能够提供无损检测和高分辨率而引发了极大的关注。然而，发光温度计目前存在相对灵敏度受限和单一温度测量模式的局限性。在此，设计了在La(MoO) : Yb, Ln（LMO : YbLn，Ln = Er、Ho、Nd）荧光粉中具有高灵敏度的近红外双模比率温度计。有趣的是，通过有效的声子辅助能量转移过程，观察到近红外发射（Nd : F → I）的热增强超过492倍，在313 K时产生了2.84 % K的超高相对灵敏度。此外，利用Ho的I能级（1200 nm）和Er的I能级（1550 nm）制作了近红外比率温度计。依靠Er的发光热增强和Ho的发光热猝灭，在573 K时获得了0.31 % K的相对灵敏度。通过对不同厚度的穿透鸡胸肉进行光谱监测，合理地证实了样品出色的近红外发射。这些发现为近红外荧光粉的设计提供了一种可行的方法，有可能对近红外温度传感领域产生影响。
