Fig. 1 | Nature Communications

Fig. 1

From: A three-dimensional ratiometric sensing strategy on unimolecular fluorescence–thermally activated delayed fluorescence dual emission

Fig. 1

Chemical structures and the illustration of sensor working. a 1, 2, and b 3 and an outline for the construction of a 3-D ratiometric luminescent sensor (wavelength and lifetime ratio vs polarity), with the employment of the TADF from a CT state as a sensing signal, and the FL from the LE state as an internal reference. The illustration of the purple lines represents the FL emission staying insensitive to environmental polarity, while that of the dark cyanine lines represents the TADF bathochromically shifting in emission wavelength and reducing in lifetime along with the increase of polarity. CT, charge transfer; FL, fluorescence; TADF, thermally activated delayed fluorescence

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