Abstract
Different from the popular 2H11/2/4S3/2–4I15/2 emission bands of Er3+, here we demonstrate for the first time the temperature detecting ability of the 4F7/2/4S3/2–−4I15/2 transitions of Er3+ embedded in NaYF4 nanocrystals via luminescent ratiometric method. Following the NIR irradiation at 980 nm, the characteristic 2H11/2/4S3/2–−4I15/2 transitions of Er3+, and the 4F7/2–4I15/2 emission line that is rarely studied are successfully detected. The 4F7/2/2H11/2/4S3/2 excited states are found to own the same lifetime. By studying on the temperature dependent upconversion luminescence, the 4F7/2/4S3/2 states, and the 2H11/2/4S3/2 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 4F7/2/4S3/2–4I15/2 emission bands could achieve a larger relative sensitivity than the traditional 2H11/2/4S3/2–4I15/2 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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