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TADF-Emitting Zn(II)-Benzoporphyrin: An Indicator for Simultaneous Sensing of Oxygen and Temperature
journal contribution
posted on 2020-04-08, 15:40 authored by Silvia
E. Zieger, Andreas Steinegger, Ingo Klimant, Sergey M. BorisovA new
luminescent indicator is presented that enables simultaneous
measurement of oxygen and temperature at a single wavelength. The
indicator, an alkylsulfone-substituted Zn(II)-meso-tetraphenyltetrabenzoporphyrin, emits prompt and thermally activated
delayed fluorescence (TADF). TADF is sensitive toward oxygen and temperature
and is referenced against prompt fluorescence (PF) that is not affected
by oxygen. The information on both parameters is accessed from the
decay time of TADF and the temperature-dependent ratio of TADF and
PF. Sensor foils, made from poly(styrene-co-acrylonitrile)
and the indicator dye, enable temperature-compensated trace oxygen
sensing (0.002–6 hPa pO2) at ambient conditions.
Compared to the previously reported dual sensors based on two emitters,
the new sensor significantly simplifies the experimental setup and
eliminates risks of different leaching or photobleaching rates by
utilizing only one indicator dye and operating at a single wavelength.