Mercaptosuccinic acid capped cadmium telluride quantum dots as luminescent thermometer over a wide temperature range of −100 to 60

• Published in: Materials letters Vol. 352
• Main Authors: Jiang, Xinbing, Yang, Huan, Fei, Yuxi, Wang, Jiuhong, Ding, Shujiang
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.12.2023
• Subjects: Cryogenic; Fluorescence; Quantum dots; Sensors; Thermometry; Cryogenic; Fluorescence; Sensors; Quantum dots; Thermometry
• ISSN: 0167-577X; 1873-4979
• DOI: 10.1016/j.matlet.2023.135228

[Display omitted] •MSA-CdTe QDs luminescent thermometer has a wide sensing range from −100℃ to 60℃.•Spectral shift style QD sensor with temperature sensitivity coefficient is 0.11 nm/℃.•Crystal expansion due to heating causes a thermal-sensitive spectral change in QDs.•PL lifetime style QD sensor with temperature sensitivity coefficient is −0.095 ns/℃. Thermal-sensitive photoluminescence (PL) properties of cadmium telluride quantum dots capped with mercaptosuccinic acid (MSA-CdTe QDs) were investigated by collecting QDs’ PL steady-state spectra and decay curves from a cryogenic temperature of −100℃ to 60℃. These QDs display peak wavelength redshift and shorten fluorescence lifetime with the increase of temperature. In situ XRD patterns showed that the QDs’ grain size increases due to thermal expansion induced by the increasement of temperature, which further leads to the redshift of luminescence peak wavelength position. The results prove MSA-CdTe QDs are excellent candidates for luminescence thermometry over a broad temperature range of −100 to 60℃.