Study on optical temperature sensing properties of β-NaYF4:Tm3+/Yb3+ nanoparticles

• Published in: Materials research bulletin 2018-10, Vol.106, p.353-356
• Main Authors: Liu, Litao, Cheng, Lihong, Xu, Sai, Qi, Xiaohui, Liu, Zhilin, Zhang, Xuan, Chen, Baojiu, Hua, Ruinian
• Format: Article
• Language: English
• Subjects: DOPED MATERIALS; EMISSION SPECTRA; EXCITATION; FLUORESCENCE; MATERIALS SCIENCE; NANOPARTICLES; PYROLYSIS; RARE EARTHS; SENSITIVITY; SENSORS; SYNTHESIS; Temperature sensor; THERMOMETERS; THULIUM IONS; Upconversion nanoparticals; YTTERBIUM IONS; β-NaYF4Tm3+/Yb3
• ISSN: 0025-5408; 1873-4227
• DOI: 10.1016/j.materresbull.2018.06.015

The β-NaYF4:Yb3+, Tm3+ NPs were synthesized via a thermal decomposition method for the first time. It was found the sensitivity of UCNPs is higher than previous reported other rare-earth (Er3+, Nd3+, Pr3+, Sm3+, Dy3+) doped materials as a temperature sensor owing to the large energy level gap between the 3F2,3 and 3H4 of Tm3+ ions. [Display omitted] •The sensitivity is higher than previous reported other rare-earth doped materials.•The maximum sensitivity of the samples is 2103.67/T2.•The FIR is linear with excitation current (1.2–2.0 A). As an optical temperature sensor, rare earth ions (Tm3+/Yb3+) co-doped β-NaYF4 upconversion nanoparticles (UCNPs) were synthesized via a thermal decomposition method. Fluorescence intensity ratio (FIR) between the 700 nm (3F2,3→3H6) and 800 nm (3H4→3H6) corresponding to the emission spectra of Tm3+ was studied in the temperature range of 300–498 K under 980 nm excitation as a function of optical thermometry. It was found that the temperature sensing sensitivity of Tm3+/Yb3+ co-doped β-NaYF4 UCNPs was higher than that of other rare-earth doped materials which were reported previously by using FIR technique in terms of sensitivity. β-NaYF4:Tm3+/Yb3+ UCNPs were promising to be a temperature sensor with the high sensitivity and resolution, especially with the superior property of well separated emission bands (700 nm and 800 nm).