Study Of Fluorescence Temperature Sensor Based On CdSe/ZnS Core-shell Quantum Dots Thin Film

Traditional temperature sensors have security risks owing to using electric when working, so its applications are limited. While based on the temperature-changing movement effects of photoluminescence(PL) in nanometer-scaled semiconductor thin film, quantum dots temperature sensors can measure temperature through self-reference peak intensity, peak wavelength and full width at half maximum(FWHM) of PL at the same time. Thereby, the quantum dots temperature sensors have such advantages as high accuracy and high resolution.A temperature sensor based on the temperature characteristics of PL in CdSe/ZnS core-shell quantum dots(QDs) thin film is designed and fabricated. The results show that PL of the CdSe/ZnS QDs thin film changes regularly with increasing temperature in the range of 30-160 ℃. The self-reference peak intensity of PL decreases with increasing the temperature, while their peak wavelength and FWHM increase. Moreover, the temperature characteristics of self-reference peak intensity, peak wavelength and FWHM are respectively obtained by fitting one, one and two times fitting function relations. The corresponding correlation indexes R2 reach above 96.6%. Furthermore, the temperature sensitivity of peak wavelength reaches 0.06 nm/℃ and the resolution reaches about 0.1 ℃. Besides, the temperature detecting by self-reference peak intensity is more stable and accuracy than that only by peak intensity.