Temperature sensing property of hollow-core photonic bandgap fiber filled with CdSe/ZnS quantum dots in an UV curing adhesive

A temperature sensor based on the hollow-core photonic bandgap fiber filled with the CdSe/ZnS QDs dissolved in an ultraviolet (UV) curing adhesive is reported. The sensor shows a linear variation of the photoluminescence (PL) peak wavelength for a temperature range from 40 °C to 140 °C, with a correlation factor of 0.99263 and a sensitivity of 0.05744 nm/°C. Although the peak intensity of emission spectrum increased exponentially with the temperature, a linear temperature-dependence result with a correlation factor of 0.99917 and a slope of 2.04 × 10−3 °C−1 can be obtained with a self-reference spectral intensity method. The linear variation characteristics of the peak wavelength and the self-reference intensity of PL spectrum indicates the designed fiber temperature sensor is feasible in the practical application.