Journal
JOURNAL OF LUMINESCENCE
Volume 206, Issue -, Pages 335-341Publisher
ELSEVIER
DOI: 10.1016/j.jlumin.2018.10.023
Keywords
Er3+; Upconversion; Thermal sensing; Luminescence intensity ratio; F-4(7/2)-I-4(15/2) transition
Categories
Funding
- National Key Research and Development Program of China [2016YFF0102803]
- National Natural Science Foundation of China [81571720, 61505045]
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Different from the popular H-2(11/2)/S-4(3/2)-I-4(15/2) emission bands of Er3+, here we demonstrate for the first time the temperature detecting ability of the F-4(7/2)/S-4(3/2)- - I-4(15/2) transitions of Er3+ embedded in NaYF4 nanocrystals via luminescent ratiometric method. Following the NIR irradiation at 980 nm, the characteristic H-2(11/2)/S-4(3/2) - I-4(15/2) transitions of Er3+, and the F-4(7/2)-I-4(15/2) emission line that is rarely studied are successfully detected. The F-4(7/2)/H-2(11/2)/S-4(3/2) excited states are found to own the same lifetime. By studying on the temperature dependent upconversion luminescence, the F-4(7/2)/S-4(3/2) states, and the H-2(11/2)/S-4(3/2) ones are both confirmed to be thermally coupled. The luminescence intensity ratio between each pair of states thus could be used for thermal sensing. Using the F-4(7/2)/(S3/2I15/2)-S-4-I-4 emission bands could achieve a larger relative sensitivity than the traditional H-2(11/2)/S-4(3/2)-I-4(15/2) ones in the range of 332-483 K. Therefore, our work proposes a promising candidate for temperature measurement, which may find its application in the future.
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