Core-Shell NaYF4:Yb3+/Tm3+@NaGdF4:Ce3+/Eu3+ Nanoparticles for Upconversion and Downconversion Dual-Mode Fluorescence-Based Temperature Sensing

作者：Meng, Mingzhou; Zhang, Rui; Fa, Xinmeng; Yang, Jianghua; Cheng, Zhenlong; Qiao, Xin; Ou, Jun^*; Wurth, Christian; Resch-Genger, Ute^*

来源：ACS Applied Nano Materials, 2022.

DOI：10.1021/acsanm.2c01611

• dual mode
• upconversion
• downconversion
• temperature measurement
• rare-earth
• temperature sensing

NaYF4 as the core and NaGdF4 as the outer layer were used to obtain NaYF4:Yb3+/Tm3+@NaYF4:Ce3+/Eu3+ nanoparticles. Physical and morphological investigations indicated that the obtained nanoparticles were prepared in a hexagonal shape, with the NaGdF4 shell layer uniformly encapsulated on the NaYF4 core. Strong Tm3+ upconversion emission peaks were observed for a 980-nm-laser-excited sample, while strong Eu3+ downconversion emission peaks were observed for a 254nm-laser-excited sample. By zonal doping of Tm(3+ )and Eu3+, their fluorescence intensity can be significantly increased; more importantly, simultaneous temperature measurements with dual-mode upconversion/downconversion can be achieved. The temperature measurement properties of the dual mode were also investigated, and it was discovered that the upconversion F-3(3 )-> H-3(6) and (1)G(4) -> F-3(4) thermocouple energy levels gave the best temperature measurements with maximum absolute and relative sensitivities of 0.0877 K-1 and 1.95% K-1, respectively, which are better than the current temperature measurement sensitivities of most rare-earth-based materials. This material was prepared as fiber-optic temperature-sensing probes to detect the temperature in the environment in real time and was found to perform excellently for temperature measurement.

• 单位
  桂林理工大学