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A Thermometer Based on Er‐Sensitized Phosphors Gd 2 (WO 4 ) 3 :Er,Yb@SiO 2 in Near‐Infrared and Visible Regions
Author(s) -
Wang Huayao,
Sun Zhen,
Wei Yanling,
Jia Mochen,
Hou Bofei,
Li Xin,
Lin Fang,
Zhang Mingxuan,
Xu Yang,
Fu Zuoling
Publication year - 2020
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201900773
Subject(s) - phosphor , thermometer , analytical chemistry (journal) , coprecipitation , infrared , materials science , excitation , atmospheric temperature range , fluorescence , chemistry , optics , optoelectronics , physics , inorganic chemistry , chromatography , quantum mechanics , meteorology
Currently, the ratiometric temperature sensing based on thermally coupled levels and nonthermally coupled levels dominates the optical thermometers. Herein, Gd 2 (WO 4 ) 3 :Er,Yb@SiO 2 phosphors are successfully synthesized by the one‐pot coprecipitation method. The themperature sensing properties based on fluorescence intensity ratio (FIR) at 808 nm excitation are investigated in detail. In the visible region, the maximum relative sensitivity ( S r ) of 0.0112 K −1 based on thermally coupled energy levels of Er 3+ ( 2 H 11/2 and 4 S 3/2 ) is achieved at 323 K, whereas the maximum of S r based on nonthermally coupled energy levels of Er 3+ ( 4 I 13/2 ) and Yb 3+ ( 2 F 5/2 ) in the near‐infrared region is 0.0035 K −1 at the lowest temperature 303 K, indicating that the thermometer can be used in the biological temperature range. Moreover, to determine which kind of thermal sensing method is more reliable, the relative standard deviation (RSD) is calculated. In comparison, it is confirmed that temperature sensing based on thermally coupled levels is more stable.