Journal
CERAMICS INTERNATIONAL
Volume 44, Issue 11, Pages 12670-12675Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2018.04.067
Keywords
Upconversion; Thermometry; Ferroelectricity; Split
Categories
Funding
- National Natural Science Foundation of China [61378068]
- K. C. Wong Magna Fund in Ningbo University
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The Er3+ doped 0.84(PMN-PT) - 0.14PYN ceramics were employed as a temperature-sensing material. The obtained compounds exhibit strong visible upconversion (UC) fluorescence under a 980-nm diode laser excitation. On account of the Stark split effect, the H-2(11/2), S-4(3/2), and F-4(9/2) levels of Er3+ split into two Stark sublevels, respectively. The fluorescence intensity ratios (FIR) between these sublevels were calculated in a temperature range of 133-573 K, and a linear FIR vs. temperature relation has been found. FIR of A/B shows a wide temperature sensing range with a relatively low sensitivity of 0.003 K-1. Meanwhile E/C illustrates the highest sensitivity of 0.0134 K-1 but in the smallest temperature range 453-573 K. FIR technique provides us a optical thermometric method with constant sensitivity in a wide temperature range.
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