Journal
CHEMICAL ENGINEERING JOURNAL
Volume 385, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2019.123906
Keywords
Upconversion; Anti-temperature quenching; Energy transfer; Temperature sensing; Sensitivity
Categories
Funding
- National Natural Science Foundation of China [11874101]
- Program for Liaoning Innovation Team in University [LT2016011]
- Natural Science Foundation of Liaoning Province [2019-MS066]
- Science and Technique Foundation of Dalian [2017RD12]
- Fundamental Research Funds for the Central Universities [wd01155]
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In this paper, we report the temperature-dependent energy transfer (ET) process between Er3+ and Nd3+ ions and optical temperature sensing properties based on the upconversion (UC) luminescence of EP3+ and Nc(3+) in Er/Yb/Nd codoped NaYF4 nanocrystals synthesized via a hydrothermal method. The decrease of green and red UC emissions of EP3+ and the increase of infrared UC emissions of Nd3+ at elevated temperatures indicated an effective ET from the Er3+ to Nd3+ ions with increasing temperature, which was investigated both experimentally and theoretically. Based on the fluorescence intensity ratio technique, the optical temperature sensing behaviors from the thermally coupled (TC) energy levels (Er3+: H-2(11/2)/S-4(3/2) and Nd3+: F-4(7/2)/F-4(5/2)/F-4(3/2)) and inter-ion energy levels between F-4(9/2) of EP(3+)and F-4(7/2)/F-4(5/2)/F-4(3/2) of Nd3+ were studied in the cryogenic region and high-temperature range. The sensing sensitivity of an optical thermal sensor based on the inter-ion energy levels between EP3+ and Nd3+ was as high as 0.83 K-1, which was an approximate increase of three orders of magnitude compared to that based on the TC energy levels of Er3+ and Nd3+. It is anticipated that the Er3+/Nd3+ codoped phosphors could be used to construct wide-range and highly sensitive luminescent thermometers.
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