Ratiometric fluorescence sensing of temperature based on perovskite nanocrystals and rhodamine B doped electrospun fibers.

Sensing temperature ( T ) has gained great attention since T is the most important parameter in daily life, scientific research and industry. A ratiometric fluorescence T sensor is fabricated by doping MAPbBr 3 perovskite nanocrystals (PNCs) and rhodamine B (RhB) into a polyacrylonitrile (PAN) matrix and the composite materials are electrospun into optical fibers. The fibers show characteristic emissions at 521 and 587 nm under UV irradiation ( λ ex = 365 nm). Both emission intensities gradually increased with elevating T , accompanied with a fluorescence color change from green to yellow. There is a linear relationship between fluorescence intensity ratio ( I 521 / I 587 ) and T in the range of 30-45 °C. The T response sensitivity is as high as 4.38% °C -1 at 45 °C.