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A Novel Optical Thermometry Strategy Based on Diverse Thermal Response from Two Intervalence Charge Transfer States
Author(s) -
Gao Yan,
Huang Feng,
Lin Hang,
Zhou Jiangcong,
Xu Ju,
Wang Yuansheng
Publication year - 2016
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201505332
Subject(s) - materials science , atmospheric temperature range , oxide , perovskite (structure) , thermal , ion , optoelectronics , analytical chemistry (journal) , crystallography , thermodynamics , physics , quantum mechanics , chemistry , chromatography , metallurgy
In this work, a novel thermometry strategy based on the diversity in thermal quenching behavior of two intervalence charge transfer (IVCT) states in oxide crystals is proposed, which provides a promising route to design self‐referencing optical temperature sensing material with superior temperature sensitivity and signal discriminability. Following this strategy, uniform Tb 3+ /Pr 3+ :NaGd(MoO 4 ) 2 micro‐octahedrons are directionally synthesized. Originated from the diverse thermal responses between Tb 3+ ‐Mo 6+ and Pr 3+ ‐Mo 6+ IVCT states, fluorescence intensity ratio of Pr 3+ to Tb 3+ in this material displays excellent temperature sensing property in a temperature range from 303 to 483 K. The maximum absolute and relative sensitivity reaches as high as 0.097 K −1 and 2.05% K −1 , respectively, being much higher than those of the previously reported optical thermometric materials. Excellent temperature sensing features are also demonstrated in the other Tb 3+ /Pr 3+ codoped oxide crystals having d 0 electron configured transition metal ions (Ti 4+ , V 5+ , Mo 6+ , or W 6+ ), such as scheelite NaLu(MoO 4 ) 2 and NaLu(WO 4 ) 2 , and monazite LaVO 4 and perovskite La 2 Ti 3 O 9 , evidencing the universal validity of the proposed strategy. This work exploits an effective pathway for developing new optical temperature sensing materials with high performance.