Infrared spectral properties for α-NaYF4 single crystal of various Er3+doping concentrations

Wang, Cheng; Xia, Haiping; Feng, Zhouming; Zhang, Zhixiong; Jiang, Dongming; Zhang, Jian; He, Shinan; Tang, Qingyang; Sheng, Qiguo; Gu, Xiuquan; Zhang, Yuepin; Chen, Baojiu; Jiang, Haochuan

doi:10.1016/j.optlastec.2016.03.012

Cited by 16 publications

(1 citation statement)

References 25 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In water, the overall emission intensity is lower due to an increase in water-induced non-radiative losses. These mainly affect the sensitizer Yb 3+ [ 53 , 54 ] and therefore suppress the activator emission. It has previously been shown that the quenching of luminescence in the VIS and NIR regions could be prevented by using core-shell or complex core-multi-shell structures [ 55 , 56 , 57 ].…”

Section: Introductionmentioning

confidence: 99%

Temperature Sensing in the Short-Wave Infrared Spectral Region Using Core-Shell NaGdF4:Yb3+, Ho3+, Er3+@NaYF4 Nanothermometers

et al. 2020

View full text Add to dashboard Cite

The short-wave infrared region (SWIR) is promising for deep-tissue visualization and temperature sensing due to higher penetration depth and reduced scattering of radiation. However, the strong quenching of luminescence in biological media and low thermal sensitivity of nanothermometers in this region are major drawbacks that limit their practical application. Nanoparticles doped with rare-earth ions are widely used as thermal sensors operating in the SWIR region through the luminescence intensity ratio (LIR) approach. In this study, the effect of the shell on the sensitivity of temperature determination using NaGdF4 nanoparticles doped with rare-earth ions (REI) Yb3+, Ho3+, and Er3+ coated with an inert NaYF4 shell was investigated. We found that coating the nanoparticles with a shell significantly increases the intensity of luminescence in the SWIR range, prevents water from quenching luminescence, and decreases the temperature of laser-induced heating. Thermometry in the SWIR spectral region was demonstrated using synthesized nanoparticles in dry powder and in water. The core-shell nanoparticles obtained had intense luminescence and made it possible to determine temperatures in the range of 20–40 °C. The relative thermal sensitivity of core-shell NPs was 0.68% °C−1 in water and 4.2% °C−1 in dry powder.

show abstract