TADF-Emitting Zn(II)-Benzoporphyrin: An Indicator for Simultaneous Sensing of Oxygen and Temperature.

Silvia E Zieger,Sergey M Borisov,Ingo Klimant,Andreas Steinegger

doi:10.1021/acssensors.9b02512

Silvia E Zieger, Sergey M Borisov + Show 2 more

Open Access

https://doi.org/10.1021/acssensors.9b02512

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Journal: ACS sensors	Publication Date: Mar 27, 2020
Citations: 32	License type: cc-by

Affiliation: Aarhus University, Graz University of Technology

Abstract

A 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.

Highlights

A new luminescent indicator is presented that enables simultaneous measurement of oxygen and temperature at a single wavelength
Indicators based on thermally activated delayed fluorescence, can be promising for the temperature-compensated determination of oxygen because DF is inherently sensitive toward temperature.[48,49,56,57]
In contrast to prompt fluorescence (PF) and phosphorescence that are quenched at higher temperatures because of the more efficient nonradiative deactivation, the intensity of DF initially increases with temperature

Summary

Introduction

A new luminescent indicator is presented that enables simultaneous measurement of oxygen and temperature at a single wavelength. Made from poly(styrene-co-acrylonitrile) and the indicator dye, enable temperature-compensated trace oxygen sensing (0.002−6 hPa pO2) at ambient conditions. The emission of these complexes is dually responsive to oxygen (decay time change) and temperature (a ratio of DF to phosphorescence) and allows determination of both parameters via twowavelength read-out.

Results

Conclusion