An effective oxygen content detection in phosphorescence of PtOEP-C6/Poly (St-co-TFEMA)

• Published in: Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy Vol. 257; p. 119786
• Main Authors: Zhang, Honglin, Liu, Ting, Zhang, Xiyu, Zhao, Hua, Zheng, Yangdong, Qin, Feng, Zhang, Zhiguo, Sheng, Tianqi, Tian, Ye
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 05-08-2021
• Subjects: Oxygen sensing; Phosphorescence; Quenching constant KSV; Temperature modification; Quenching constant KSV; Phosphorescence; Temperature modification; Oxygen sensing
• ISSN: 1386-1425
• DOI: 10.1016/j.saa.2021.119786

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•The temperature modified oxygen sensing method is proposed.•The Stern-Volmer equations kept high linearity at any temperature.•The mechanism of oxygen quenching constant KSV changes with temperature is given.•Our results provide an effective method to gain accurate oxygen content by simple optical measurement.
The phosphorescence of PtOEP-C6/Poly (St-co-TFEMA) has been investigated to achieve an accurate oxygen content, which is always puzzled as its extreme temperature sensitivity. The relations of oxygen content and phosphorescence intensity ratio can be perfectly fitted by the Stern-Volmer equation at different temperatures, meanwhile the monotonic quenching constant KSV is obtained, which enables us to develop a method of temperature correction to realize the intrinsic oxygen content. Then a clear fundamental picture of the temperature quenching mechanism of PtOEP is drawn by the time-resolved spectroscopy, the temperature sensitivity of phosphorescence arises from the enhanced quenching effect of oxygen by temperature. Our results provide an effective method to gain accurate oxygen content by simple optical measurement.