Optical thermometry based on upconversion luminescence in Yb3+/Ho3+ co-doped NaLuF4

• Published in: Journal of alloys and compounds 2014-03, Vol.588, p.654-657
• Main Authors: Zhou, Shaoshuai, Jiang, Sha, Wei, Xiantao, Chen, Yonghu, Duan, Changkui, Yin, Min
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Exact sciences and technology; Fluorescence intensity ratio; Hydrothermal method; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical thermometry; Other solid inorganic materials; Photoluminescence; Physics; Upconversion
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2013.11.132

Short wavelength upconversion luminescence of Ho3+ was investigated for temperature sensing with fluorescence intensity ratio (FIR) technique in Yb3+/Ho3+ co-doped β-NaLuF4 hexagonal microprisms synthesized by hydrothermal method. The origins of two emission peaks located at 482.0nm and 443.6nm were identified for the first time. Further study on temperature dependence of 980nm-excited upconversion FIR between two thermally coupled multiplets (5F1/5G6 and 5F2,3/3K8) was carried out from 390K to 780K. The FIR increases with temperature monotonously and the experimental data are well fitted with a theoretical function. A large energy difference (1438cm−1) is obtained from the fitting curve, which could account for a higher relative sensitivity in this system than most RE3+ doped FIR-based temperature sensors, making this optical material a promising candidate for high-sensitive temperature sensing.