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A non-invasive luminescent nano-thermometer: approaching to the maximum thermal sensitivity of Er3+ ion’s green emission

Abstract

The green luminescence of Er3+ ion, ascribed to the 2H11/2/4S3/24I15/2 transitions, has been confirmed to be a useful tool for optical ratiometric thermometry for more than thirty years. However, the relative sensitivity for them is relatively low, being ca. 1.1 %K-1 at room temperature. To boost the sensitivity for this pair of transitions, here a non-invasive luminescent nano-thermometer, that is, Y2O3:Yb3+,Er3+, is designed by co-precipitation method. Its maximum sensitivity is as high as 1.51 %K-1 at 303 K, following the 980 nm laser diode excitation. The value is, to the best of our knowledge, larger than the most previously reported relative sensitivities for the green luminescence of Er3+ ion embedded in a variety of hosts. It is then demonstrated that the achievement of this maximum sensitivity should be ascribed to the following two factors. For one thing, Y2O3 host leads to a larger Stark split energy gap for the 2H11/2/4S3/2 states (ca. 1000 cm-1) than other reported hosts (ca. 700 cm-1). For another, the relative sensitivity for the 523/562 nm emission bands is larger than that for the 550/562 nm ones by one order of magnitude, indicating that choosing a pair of suitable transitions is important. A high temperature resolution (0.06 K) and an excellent repeatability (98.9%) are achieved for the designed nano-thermometer. The practical measuring performance for the nano-thermometer is checked at 303 K and a good result is obtained. More importantly, hard evidence is provided here to show the importance of boosting the relative sensitivity on designing the new type of nano-thermometer.

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Publication details

The article was received on 28 Feb 2019, accepted on 13 Apr 2019 and first published on 15 Apr 2019


Article type: Paper
DOI: 10.1039/C9CE00285E
Citation: CrystEngComm, 2019, Accepted Manuscript

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    A non-invasive luminescent nano-thermometer: approaching to the maximum thermal sensitivity of Er3+ ion’s green emission

    L. Li, F. Qin and Z. Zhang, CrystEngComm, 2019, Accepted Manuscript , DOI: 10.1039/C9CE00285E

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