Affiliation:
1. Graduate School of Human and Environmental Studies Kyoto University Sakyo‐ku Kyoto 606‐8501 Japan
2. Graduate School of Advanced Science and Technology Japan Advanced Institute of Science and Technology1‐1 Asahidai Nomi Ishikawa 923‐1292 Japan
3. School of Science Nanjing University of Posts and Telecommunications Nanjing 210023 China
Abstract
A Yb3+‐doped Gd3Al2Ga3O12 garnet (GAGG) Boltzmann thermometer is prepared and studied in this work. Due to the Boltzmann distribution of the population of Stark sublevels of Yb3+, the photoluminescence peaks of Yb3+ in the wavelength range of 950–1000 and 1000–1050 nm exhibit opposite temperature dependencies, which makes the luminescence intensity ratio (LIR) of two Yb3+ peaks work as a luminescence thermometer with a relative sensitivity of 1.6% K−1 at 200 K. It is worth nothing that this LIR value still follows the Arrhenius model at temperatures as low as 200 K. In these results, it is suggested that Yb3+‐doped GAGG thermometer can achieve high sensitivity for accurate temperature measurements. In addition, the accurate position of various Stark sublevels of Yb3+ in GAGG is obtained for the first time. In this work, it is confirmed that the Yb3+‐doped GAGG thermometer exhibits potential applications in the fields of microelectronics and biology.
Funder
Izumi Science and Technology Foundation