Two-Photon Excitation Temperature Nanosensors Based on a Conjugated Fluorescent Polymer Doped with a Europium Probe

摘要: A strongly fluorescent organic semiconducting polymer doped with a highly temperature dependent europium(III) complex is converted into nanosized material that capable of optically sensing (T) in the range from 0 to 50 °C via two-photon excitation at 720 nm. The nanosensors are prepared blue-fluorescent polyfluorene acts as both lightharvesting antenna (to capture energy) and an energy donor fluorescence resonance transfer (FRET) system. photonic absorbed by transferred T-sensitive red-luminescent europium contained nanoparticles. close spatial proximity acceptor warrants efficient FRET. poly(ethylene glycol)-co-poly(propylene oxide) block copolymer also added render particles biocompatible. It shown T can be calculated a) intensity luminescence complex, b) ratio intensities red blue luminescence, or c) T-dependent lifetime of Eu(III) complex.