Synthesis,Properties And Applications Of Triarylphosphine Oxide Compounds

Organic luminescent materials are essential in the development of human civilization,which are widely used in communication industry,display industry,laser and molecular probe.Temperature is one of the most fundamental physical parameters as it is a principal thermo dynamic property that are widely used in daily life,climate and marine research,medicine,biology,wind tunnels and military technology.At present,liquid-in-glass thermometers,electrical thermosensors,infrared thermometers have well been developed for a wide range of practical applications.However,traditional thermometers can hardly realize gradient and in situ spatial temperature measurementin large-area and micro-environments.Recently,luminescent thermometers have been actively developed for temperature detection in the above-mentioned fields with high temporal and spatial resolution.However,most of these sensor systems encounter an inevitable decreasing trend of luminescence efficiency at high temperatures,cannot be applied on high temperature detection.In this work,a series of air-stable triaryphosphine oxide-based themosensitive ratiometric sensors based on Local excited(LE)and charge transfer(CT)emissions have been designed and synthesized.The fluorescence intensity of tri(pyren-1-yl)phosphine oxide exhibits prominent temperature-dependent feature over a wide temperature range due to thermally populated emissive LE states.The wide ratiometric temperature sensing range and high stability/reversibility in ambient atmosphere indicate their great potentials in facile and practical applications.Next,we have developed two excited-state intramolecular proton transfer(ESIPT)compounds with large Stokes shifts in solid-state,which are easily prepared by high yield by Suzuki reaction.The PL spectra of HBTPy and HBTPhe show higher sensitivity to temperature compared to C2 and C3.By mixing them in PMMA poly mermatrix,we established a solid-state fluorescent temperature probe over a wide range from-80 to 170 oC based on frustrated energy transfer crosstalk.These solid-state fluorescent temperature probes exhibit many advantages such as wide-range and high temperature detection,naked-eye-detected emission color change,large area temperature development and good film forming property,and anticipate for developing lost-cost,flexible,high temporal and spatial resolution themometers.