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

Sensing temperature () has gained great attention since is the most important parameter in daily life, scientific research and industry. A ratiometric fluorescence sensor is fabricated by doping MAPbBr 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 ( = 365 nm). Both emission intensities gradually increased with elevating , accompanied with a fluorescence color change from green to yellow. There is a linear relationship between fluorescence intensity ratio ( / ) and in the range of 30-45 °C. The response sensitivity is as high as 4.38% °C at 45 °C.